David M Jackson

USA TODAY

Donald Trump is under political fire even from some Republicans and his poll numbers are heading in the wrong direction, but aides insist that things are turning around.

"An improving week," campaign chairman Paul Manafort said Friday on Fox News.

Trump's recent troubles include more back-and-forth with Republican leaders, including House Speaker Paul Ryan, but Manafort said voters will soon see a coming together with the Republican National Committee and party leaders.

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"We are working very strongly with (chairman) Reince Priebus and the RNC and with the Republican leadership in the House and the Senate," Manafort said.

He also told Fox: "I think you will see a coming together of both Paul Ryan, Mitch McConnell and Donald Trump in the course of this campaign because they all agree on one thing. We need a Republican president and a Republican Congress and then we’ll make the changes that America needs.”

In recent days, Trump pointedly refused to endorse Ryan, the House speaker who faces a Republican primary challenge next week.

Ryan, who has criticized aspects of Trump's campaign, replied that his endorsement of the New York businessman is not a blank check, and "if I see and hear things that I think are wrong, I'm not going to sit by and say nothing."

McConnell, the Senate Republican leader, has also criticized the Trump campaign.