WASHINGTON (AP) — The Latest on Campaign 2016 (all times EDT):

10 p.m.

Donald Trump joked about riding a mechanical bull at a rally in Texas Thursday — but seemed a little confused by the concept.

"I read about this place," Trump told a crowd at Gilley's Dallas South Side Ballroom. "Where's that horse?"

Trump appeared to be referring to the venue's mechanical bull. The original Gilley's and its bull were featured prominently in the 1980 movie "Urban Cowboy."

Trump predicted his ride would be a smash in the news.

"Hey, you want to hit the papers tomorrow? Let's get that horse. I'll ride that horse," said Trump. "The problem is, even if I make it, they'll say I fell off the horse and it was terrible."

Trump was also inspired by a protester's cowboy hat and suggested selling a "Make America Great Again" version.

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9:30 p.m.

Donald Trump is marking the one-year anniversary of his presidential campaign launch with a rally in Texas that is offering a heavy dose of nostalgia.

The presumptive Republican nominee spent much of the rally Thursday night at a Dallas concert space recounting his victories during his party's hard-fought primary, offering a state-by-state recap.

He says, "This is the one-year anniversary, and hopefully we're going to make it a worthwhile year."

Trump did not mention by name one of his former rivals, Texas Sen. Ted Cruz — who won the Texas primary handily and has yet to endorse Trump.

Trump told the crowd he expects winning the general election against likely rival Hillary Clinton in November to be more difficult than the primary because of a dishonest press.

He says: "You know, it's funny. I didn't love the press during the primaries, but now it's, like, brutal."

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3:46 p.m.

Republican national security official Richard Armitage is supporting Democratic presidential candidate Hillary Clinton over GOP hopeful Donald Trump.

Clinton's campaign says the George W. Bush's former deputy secretary of state has endorsed her candidacy.

He told Politico that Trump "doesn't appear to be a Republican" and "doesn't appear to want to learn about the issues."

Armitage refused to confirm his support for Clinton to the Associated Press.

He is the most prominent Republican to back Clinton. Dozens of foreign policy and national security experts signed a letter earlier this year opposing Trump but few have openly said they will vote for Clinton. They say Trump's views on international affairs are inconsistent and would make the country less safe.

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1:28 p.m.

Republican Donald Trump is slamming AFL-CIO leadership for its decision to endorse his likely rival, Democrat Hillary Clinton.

The likely GOP nominee in a lengthy statement accuses the AFL-CIO of selling out its members by endorsing a candidate he alleges is "the enemy of working people."

He says, "The leadership of the AFL-CIO has made clear that it no longer represents American workers."

Trump goes on to predict the union's members will wind up voting for him in much larger numbers than Clinton in November, despite their union's endorsement.

He adds that Clinton's ties to Wall Street means she "is the enemy of working people." Trump vows to "fight harder for American workers than anyone ever has."

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11:16 a.m.

Hillary Clinton has won the endorsement of the AFL-CIO, the nation's largest labor federation, in another sign of her consolidation of the Democratic party heading into next month's Philadelphia convention.

The AFL-CIO's general board voted to endorse Clinton over Vermont Sen. Bernie Sanders, a move that had been expected since Clinton had secured enough support among delegates to become the presumptive Democratic nominee.

The labor federation includes 12.5 million members and is a potent force in Democratic politics. Union leaders have been gearing up for a general election showdown against Republican Donald Trump, whom they portray as a threat to working families.

The AFL-CIO had withheld its endorsement during the primaries as Clinton was challenged by Sanders.