Sanders: Trump will be a one-term president
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Sen. Bernie SandersBernard (Bernie) SandersSanders thanks Iowa voters for giving momentum to progressive agenda Live coverage: Gillum clashes with DeSantis in Florida debate Miami Herald endorses Gillum for governor MORE (I-Vt.) on Wednesday said he doesn't believe President TrumpDonald John TrumpFive takeaways from Gillum and DeSantis’s first debate GOP warns economy will tank if Dems win Gorbachev calls Trump's withdrawal from arms treaty 'a mistake' MORE will win a second term.

"In terms of the first three months in office, Donald Trump is the least popular president in the history of polling," Sanders told The Associated Press while speaking in New York. "I do not believe that if Trump continues these policies that he's going to be reelected. Nor do I think that the Republicans are going to do well in 2018."

Sanders, who is planning to launch a cross-country tour with Democratic National Committee Chairman Tom Perez next week, said a more progressive movement is underway that will hurt Republicans' electoral chances.

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"The momentum right now is with the progressive movement in this country," Sanders said. "And I think the Republicans are on the defensive and will be on the defensive increasingly."

Sanders pointed to Tuesday's special election in Kansas, in which the Republican candidate narrowly won the House seat vacated by CIA Director Mike Pompeo in a deep-red district that Trump won overwhelmingly.

"The Republicans had to spend money like crazy at the end to beat him," Sanders said. "I think that's a very good omen for the future."

Ron Estes defeated civil rights attorney James Thompson (D) Tuesday, overcoming a surprisingly tough challenge and denying Democrats a major upset in Kansas's 4th District.