President-elect Joe Biden’s son Hunter said Wednesday that he is facing a federal investigation into his taxes, putting a renewed spotlight on the questions about his financial dealings that dogged his father’s campaign.

Federal investigators served a round of subpoenas on Tuesday, including to Hunter Biden, according to a person familiar with the investigation who spoke on condition of anonymity to discuss an ongoing probe. The tax investigation centers on his business dealings, the person said.

The Justice Department’s investigation, centering on potential tax fraud crimes, had been going on at least a year before President-elect Biden announced his candidacy, according to another person familiar with the matter. Investigators did not reach out in the weeks prior because of a Justice Department policy surrounding elections that prohibits overt investigative acts.

In a statement released by the president-elect’s transition office, Hunter Biden said he learned about the investigation on Tuesday but did not disclose specifics about what was being scrutinized.

“I take this matter very seriously but I am confident that a professional and objective review of these matters will demonstrate that I handled my affairs legally and appropriately, including with the benefit of professional tax advisors,” he said in a statement.

He has long been a target of President Donald Trump and his allies, who have accused him of profiting off his political connections. Trump and his supporters also raised unsubstantiated charges of corruption related to Hunter Biden’s work in Ukraine at the time his father was vice president and leading the Obama administration’s dealings with the Eastern European nation.

The disclosure of the federal investigation, led by the U.S. attorney’s office in Delaware, comes at an awkward moment for the incoming president, who is assembling his Cabinet. His pick for attorney general could have oversight of the investigation into the new president’s son if it is still ongoing when Biden is sworn in on Jan. 20.

The transition team said in a statement: “President-elect Biden is deeply proud of his son, who has fought through difficult challenges, including the vicious personal attacks of recent months, only to emerge stronger.”

Biden’s younger son has been caught up in controversies before. While his father was vice president, Hunter joined the Naval Reserve only to be discharged after testing positive for cocaine in his system, later revealing a yearslong struggle with addiction.

He also joined the board of Ukrainian energy company Burisma in 2014, sparking concerns about the perceptions of a conflict of interest given the elder Biden was deeply involved in U.S. policy toward Ukraine. A Republican-led Senate investigation did not identify any policies that were directly affected by Hunter Biden’s work.

In the weeks before the election, Trump supporters used the existence of a laptop they said was connected to Hunter Biden – and the emergence of someone who maintains he had business discussions with him – to raise questions about Joe Biden’s knowledge of his son’s activities in Ukraine and China. The president-elect has said he did not discuss his son’s international business dealings with him and has denied having ever taken money from a foreign country.

The laptop surfaced publicly in October when The New York Post reported on emails that it said had come from Hunter Biden’s laptop and that it said it received from Rudy Giuliani, Trump’s personal lawyer.

Another person familiar with the matter told the AP that the tax investigation does not have anything to do with the laptop.

The people had knowledge of the investigation but were not authorized to discuss the matter publicly and spoke to the AP on condition of anonymity.

In a CNN interview last week, President-elect Biden addressed the business dealings of his son Hunter and his brothers, pledging that they would avoid any perceived conflicts of interest during his time in office.

“My son, my family will not be involved in any business, any enterprise that is in conflict with or appears to be in conflict, where there’s appropriate distance from the presidency and government,” Biden said.

The U.S. government and 48 states and districts sued Facebook Wednesday, accusing it of abusing its market power in social networking to crush smaller competitors and seeking remedies that could include a forced spinoff of the social network’s Instagram and WhatsApp messaging services.

The landmark antitrust lawsuits, announced by the Federal Trade Commission and New York Attorney General Letitia James, mark the second major government offensive this year against seemingly untouchable tech behemoths. The Justice Department sued Google in October for abusing its dominance in online search and advertising – the government’s most significant attempt to buttress competition since its historic case against Microsoft two decades ago. Amazon and Apple also have been under investigation in Congress and by federal authorities for alleged anticompetitive conduct.

James noted at a press conference that “it’s really critically important that we block this predatory acquisition of companies and that we restore confidence to the market.”

The FTC said Facebook has engaged in a “systematic strategy” to eliminate its competition, including by purchasing smaller up-and-coming rivals like Instagram in 2012 and WhatsApp in 2014. James echoed that in her press conference, saying Facebook “used its monopoly power to crush smaller rivals and snuff out competition, all at the expense of everyday users.”

The FTC fined Facebook $5 billion in 2019 for privacy violations and instituted new oversight and restrictions on its business. The fine was the largest the agency has ever levied on a tech company, although it had no visible impact on Facebook’s business.

Facebook called the government actions “revisionist history” that punishes successful businesses and noted that the FTC cleared the Instagram and WhatsApp acquisitions years ago. “The government now wants a do-over, sending a chilling warning to American business that no sale is ever final,” Facebook general counsel Jennifer Newstead said in a statement that echoed the company’s response to a recent congressional antitrust probe.

Facebook is the world’s biggest social network with 2.7 billion users and a company with a market value of nearly $800 billion whose CEO Mark Zuckerberg is the world’s fifth-richest individual and the most public face of Big Tech swagger.

James alleged Facebook had a practice of opening its site to third-party app developers, then abruptly cutting off developers that it saw as a threat. The lawsuit – which includes 46 states, Guam and the District of Columbia – accuses Facebook of anti-competitive conduct and using its market dominance to harvest consumer data and reap a fortune in advertising revenues.

North Carolina Attorney General Josh Stein, who was on the executive committee of attorneys general conducting the investigation, said the litigation has the potential to alter the communications landscape the way the breakup of AT&T’s local phone service monopoly in the early 1980s did.

“Our hope is to restructure the social networking marketplace in the United States, and right now there’s one player,” Stein told reporters. James said the coalition worked collaboratively with the FTC but noted the attorneys general conducted their investigation separately.

Antitrust expert Rebecca Allensworth, a law professor at Vanderbilt University, said it is “hard to win any antitrust lawsuit and this one is not any different.” But as far as antitrust cases go, she added, the government has a strong one.

The Justice Department’s suit against Google, announced just two weeks before Election Day, brought accusations of political motivation from some quarters. It was filed by a cabinet agency headed by an attorney general seen as a close ally of President Donald Trump, who has often publicly criticized Google.

The FTC, by contrast, is an independent regulatory agency whose five commissioners currently include three Republicans and two Democrats.

President-elect Joe Biden has said the breakup of Big Tech giants should be seriously considered. He has singled out Facebook’s Zuckerberg for scorn, calling him “a real problem.”

Instagram and WhatsApp are among some 70 companies that Facebook has acquired over the past 15 years. But they are the ones most frequently held up by Facebook critics as properties that should be split off.

Facebook paid $1 billion for Instagram, bolstering the social network’s business a month before its stock went public. At the time, the photo-sharing app had about 30 million users and wasn’t producing any revenue. A few years later, Facebook acquired WhatsApp, an encrypted messaging service, for $19 billion.

Zuckerberg vowed both companies would be run independently, but over the years the services have become increasingly integrated. Users are now able to link accounts and share content across the platforms. Instagram now has more than 1 billion users worldwide. Such integration could make it more difficult to break off the companies.

NetChoice, a Washington trade association that includes Facebook as a member, quickly panned the lawsuits. The case for antitrust enforcement against Facebook “has never been weaker,” NetChoice vice president Carl Szabo said in a statement, pointing to newer social services such as TikTok and Snapchat as rivals that could “overtake” older platforms.

“These lawsuits mark an important turning point in the battle to rein in Big Tech monopolies and to reinvigorate antitrust enforcement,” said Alex Harman, competition policy advocate for Public Citizen, a nonprofit consumer advocacy group.