Ellen Weintraub, the chair of the Federal Election Commission, said on CNN Monday that "there is no evidence of rampant voter fraud in 2016 or really in any previous election," despite President Trump's claims.

Why it matters: Weintraub stressed such statements from the president can cause "people to lose faith" and "to question the results."

Driving the news: During a rally in New Hampshire last week, Trump claimed he would have won the state in the 2016 if it weren't for voter fraud.

Weintraub sent a letter to Trump on Friday and asked the president "to provide any evidence" that could prove those statements. "To put it in terms a former casino operator should understand: There comes a time when you need to lay your cards on the table or fold," she wrote.

She told CNN that the White House has yet to respond.

The exchange:

WEINTRAUB: "Facts matter. And people of America need to be able to believe what their leaders tell them." ...

CNN'S JOHN BERMAN: "Has the White House ever — and I mean including the commission chaired by Mike Pence — produced any evidence and handed over to you, the Federal Election Commission, of fraud in New Hampshire or California or other places in 2016?"

WEINTRAUB: "No. I'm not aware of them handing any evidence over to the local law enforcement authorities who would have jurisdiction over what happened in their own states. In fact, I've heard from folks at the state and local level who were offended by this. They thought it was insulting to the way they ran their elections in each and every state to suggest that they would allow this kind of rampant voter fraud to go on. ... To put out information that has no proof, has no evidence behind it, ... it's damaging to our democracy."

BERMAN: "How?"

WEINTRAUB: "It causes people to lose faith. It causes people to question the results. We have some threats to our democracy right now. ... To be suggesting to people that if the candidate that they don't like — if the candidate they choose doesn't win, that it's because of fraud, that undermines our democracy. It undermines people's faith. Once that faith is broken, it is very hard to build up again."

Go deeper: Trump cites misleading Texas statistics in voter fraud claim