Donald Trump declared on Twitter on Sunday that the meeting last week between President Bill Clinton and Attorney General Loretta Lynch was clearly arranged beforehand, and called it proof that the fix is in regarding the Justice Department's investigation into whether Hillary Clinton violated federal law by using a private email server while secretary of state.

"Only a fool would believe that the meeting between Bill Clinton and the U.S.A.G. was not arranged or that Crooked Hillary did not know," Trump tweeted Sunday afternoon.

In follow-up a few minutes later he said: "Crooked Hillary Clinton knew that her husband wanted to meet with the U.S.A.G. to work out a deal. The system is totally rigged & corrupt!"

The messages followed a day in which Clinton's surrogates fanned out throughout the Sunday morning news shows to argue that the meeting between the Lynch and Clinton, which the attorney general herself conceded was a mistake, didn't in any way taint the investigation and that Lynch should not have to recuse herself from it.

"Why stop that process?" Rep. Xavier Becerra, D-Calif., said on Fox News Sunday. "Just because you have a chance encounter with Bill Clinton, you don't throw that away."

Asked on CNN whether Clinton would step down as the party's nominee if she was indicted, Sen. Cory Booker, D-N.J., dismissed the possibility out of hand.

"Well, first of all, that is not going to happen," Booker said. He added later that it was "not even within the realm of possibility."

The probe is apparently close to wrapping up. Clinton met privately with Justice Department officials Saturday morning for a 3 1/2-hour interview. Her campaign characterized it as "a voluntary interview this morning about her email arrangements while she was secretary," and Clinton said she was happy to help the ongoing "review."

CNN has reported, based on anonymous sources, that the Justice Department has decided that charges will not be brought against Clinton.

Trump scoffed. "Does anybody really believe that Bill Clinton and the U.S.A.G. talked only about 'grandkids' and golf for 37 minutes in plane on tarmac?," he said, adding later, "I believe that Crooked Hillary sent Bill to have the meeting with the U.S.A.G. So Bill is not in trouble with H except that he got caught!"