Former House Speaker Newt Gingrich warned Wednesday that Donald Trump isn't an "acceptable" candidate to voters at the moment, and needs to change course soon to give himself a chance at beating Hillary Clinton in November.

In remarks to the Washington Post, Gingrich said Trump cannot win the White House "operating the way he is now," and said Trump is "helping" Clinton win by making himself more and more "unacceptable" to voters with his repeated missteps.

"The current race is, which of these two is the more unacceptable, because right now neither of them is acceptable," Gingrich told The Post. "Trump is helping her to win by proving he is more unacceptable than she is.

"Anybody who is horrified by Hillary should hope that Trump will take a deep breath and learn some new skills," Gingrich said. "He cannot win the presidency operating the way he is now. She can't be bad enough to elect him if he's determined to make this many mistakes."

The comments from the former speaker and finalist for Trump's running mate selection came just as a new report emerged that Republican National Committee Chairman Reince Priebus, former New York Mayor Rudy Giuliani and Gingrich are eyeing an intervention for the GOP nominee after a chaotic 48 hours, which included his continued back-and-forth with the parents of slain Capt. Humayun Khan and a refusal to back House Speaker Paul Ryan during his primary challenge.

He also declined to back Sens. John McCain and Kelly Ayotte in their re-election efforts.

The comments echo Gingrich's remarks from Tuesday night, in which he implored Trump to focus on Hillary Clinton rather than party infighting with Ryan and others. He also praised the likes of Ryan, who received an endorsement earlier Wednesday from Trump's running mate, Indiana Gov. Mike Pence.

"Trump's either got to be the leader of the party and shame on those who don't endorse him, or he's gonna be a random guy who goes around picking a lot of fights he doesn't need," Gingrich said. "John McCain has a long record of serving this country in the military, as a POW, in the House and in the Senate. He is a superb chairman of the Armed Services Committee, and he deserves the support of every rational Republican in the country.

"Paul Ryan right now is the heart of the House Republican Party," he added. "He has very high approval among Republicans across the whole country. I agree totally with Rudy Giuliani — you got one person to beat. It's Hillary Clinton. You beat Hillary Clinton, you're president. You beat 23 other people and lose to Hillary Clinton, you're not going to be president."