Sarah Sanders blamed by ex-White House official for lacking the 'credibility' to sell Trump's policies

President Donald Trump has not yet found a way to make a graceful exit from his standoff with Speaker of the House Nancy Pelosi over border wall funding.

On Friday, former presidential adviser to David Gergen appeared on CNN with Anderson Cooper and said Trump has begun to look "ridiculous" as he interferes with negotiations between Democrats and Republicans in Congress.

With Pelosi vowing not to give Trump a wall, no one knows what compromise Trump will ultimately agree to, Gergen said.

"He doesn't want to look weak, but he's looking ridiculous," said Gergen. "That's what's bothering so many Americans. The thought process is so confusing. The line of argument is so confusing. Nobody can make heads or tails of what he wants. That's really deeply distressing for Republicans."

Gergen worked in the White House with Richard Nixon, Gerald Ford, Ronald Reagan and Bill Clinton, and said Trump's problems are unique.

He put part of the blame for Trump's predicament on Sarah Huckabee Sanders, who lacks credibility when speaking to the media or the American people.

"This is where the failure to have a strong, credible press secretary and be surrounded by the people who can go on air and straighten these things out is a real weakness for him," Gergen said. "A normal White House would have one person who could go to the microphone and walk the press through this, and the president doesn't have to get involved in every little detail."

Watch below.