Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) is warning donors that the Republican Party's House majority could be in jeopardy, according to The New York Times.

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Ryan spoke in private last week to a group of donors at a political conference in Colorado sponsored by industrialists Charles and David Koch.

During the conference, the Speaker said donors shouldn't put their focus completely on the Senate and noted that Republican control of the House may also be at risk, the Times reported, citing a Republican who heard the talk.

There is reportedly growing concern among the party's wealthiest contributors over retaining control of Congress with Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE as the party's presidential nominee.

Democrats would need to pick up more than 30 House seats to take control. But according to the Times, Republicans are worried about a scenario in which they lose enough seats that Ryan is weakened and the party is on the defensive.

The Times report on Saturday painted a broad picture of Republicans worried about the impact of Trump on down-ballot races.

The party's nominee has had a difficult two weeks, capped off by the overwhelming criticism over his fight with the family of Army Capt. Humayun Khan, a soldier killed in 2004 in Iraq.

Trump also last week declined to endorse Ryan and Sen. John McCain John Sidney McCainMomentum growing among Republicans for Supreme Court vote before Election Day McConnell urges GOP senators to 'keep your powder dry' on Supreme Court vacancy McSally says current Senate should vote on Trump nominee MORE (R-Ariz.) for reelection. But the GOP changed course on Friday and backed both men.

Ryan said last week his endorsement of Trump shouldn't be seen as a blank check, noting the candidate's campaign has had a "pretty strange run since the convention."

Polls have also shown Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE with a strong bounce after the Democratic National Convention. Clinton is leading in a number of surveys nationally and in many battleground states, adding to Republicans worries.

Donors had hoped Trump would begin to shift his focus ahead of the general election.

“The conclusion has become that the guy is incorrigible,” said Thomas M. Davis III, a former House member from Virginia who is still close to many of the party’s leaders, according to The New York Times.

“He’s going to leave our candidates with no choice but to go their own separate way.”