Clinton and Sanders both celebrate victories in Tuesday’s contests

WASHINGTON (AP) – Bernie Sanders has won Oregon’s presidential primary and battled Hillary Clinton to a razor-thin margin in Kentucky, vowing to stay in the race until the end as Clinton aimed to blunt his momentum and prepare for a fall campaign against Republican Donald Trump.

Tuesday’s primary in Kentucky was too close to call with Clinton leading Sanders by less than one-half of 1 percent. Closing in on the Democratic nomination, Clinton declared victory in Kentucky nonetheless, telling her supporters on Twitter: “We’re always stronger united.”

Trump won the GOP’s Oregon primary, the only Republican contest on Tuesday. In a sign of his pivot into the general election, his campaign announced that it had signed a joint fundraising agreement with the Republican National Committee that will allow it to raise cash for both his campaign and other Republican efforts.

After months of discord within the GOP, Democrats displayed new signs that it could have trouble uniting around Clinton’s candidacy as Sanders plows through the end of the primary calendar in mid-June. Sanders will need to win about two-thirds of the remaining pledged delegates to end the primary season in a tie but is not letting up.

“Before we will have the opportunity to defeat Donald Trump, we’re going to have to defeat Secretary Clinton,” Sanders said Tuesday night to cheers in Carson, California.