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US House Speaker Paul Ryan says he will vote for the Republican presidential candidate Donald Trump in this year's election, despite their differences.

Mr Ryan "we have more common ground than disagreement".

It is the latest sign Republicans are unifying around Mr Trump. Mr Ryan has previously refused to back him.

Meanwhile Democratic challenger Hillary Clinton has attacked Mr Trump's foreign policy plans as "dangerously incoherent".

"I'll be voting for @realDonaldTrump this fall," . "I'm confident he will help turn the House GOP's [Republican Party] agenda into laws."

Explaining his decision further, he wrote in his hometown Gazette newspaper in Wisconsin: "It's no secret that he and I have our differences. I won't pretend otherwise.

"And when I feel the need to, I'll continue to speak my mind. But the reality is, on the issues that make up our agenda, we have more common ground than disagreement."

He also attacked Mrs Clinton, who is likely to be Mr Trump's Democratic opponent.

"A Clinton White House would mean four more years of liberal cronyism and a government more out for itself than the people it serves," he said.

As House Speaker, Paul Ryan is the most senior elected Republican official in the country. He and Mr Trump have held a series of talks to try to find common ground.

"We're not playing word games, feel free to call it an endorsement," one of Mr Ryan's advisers, Brendan Buck .

Despite this, some high-profile Republicans, including former Presidents George H W Bush and George W Bush, have refused to back Mr Trump.

Meanwhile, Mrs Clinton said the US would be making a "historic mistake'' in electing Mr Trump.

Attacking her rival's foreign policy ideas and temperament in a speech in California, she said "he is not just unprepared, he is temperamentally unfit".

"This is not someone who should ever have the nuclear codes.''

Mr Trump responded : "Crooked Hillary no longer has credibility - too much failure in office. People will not allow another four years of incompetence!"