Pennsylvania U.S. Senate candidates Republican Sen. Pat Toomey, left, and Democrat Katie McGinty take part in a debate at Temple University in Philadelphia, Monday, Oct. 24, 2016. Matt Rourke AP
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Meanwhile, Ohio Gov. John Kasich, a former 2016 Republican presidential candidate, emailed his supporters Tuesday seeking contributions to aid embattled GOP Senate candidates. Kasich has cut commercials and personally campaigned for Senate and House Republican candidates.

“Democrats are just four seats away from winning a majority in the U.S. Senate, but we can stop them,” Kasich says in the contribution pitch which seeks donations of $10 or more. “At least half a dozen campaigns are too close to call and we need to do all we can to win them and hold our majority!”

Kasich will use some of the money received to write checks to vulnerable GOP Senate candidates, John Weaver, a Kasich adviser, told McClatchy Tuesday night.

“We’ll cut the maximum checks that we can to the Senate races,” Weaver said, adding that the rest of the donated funds will go to the National Republican Senatorial Committee.