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During his speech in Missouri, President Trump told the Springfield crowd that Sen. Claire McCaskill (D-Mo.) must compromise with Republicans on tax reform of be voted out in 2018.

Trump said McCaskill, who strongly supported Hillary Clinton, is a key member of the bloc of "obstructionists" in the Democratic Party.

"We must lower our taxas, and your senator, Claire McCaskill - She must do this for you and if she doesn't do this for you, you have to vote her out of office," Trump said, eliciting booming cheers from the crowd.

"She's got to make that commitment," he said, criticizing Democratic "obstructionists" and adding that the United States will continue to suffer economically if the tax code is not revamped.

"Jobs and our country['s economy] cannot take off the way they should," Trump said.

He said the tax code is currently biased toward the wealthy and resourceful, saying "normal Americans" need "an army of accountants" to get similar tax breaks as big business.

"This is wrong," he said.

McCaskill previously sailed to victory in 2012 after her opponent, then-Rep. Todd Akin (R-Mo.), made controversial comments about "legitimate rape."

She, along with Sens. Bob Casey Jr. (D-Pa.), Debbie Stabenow (D-Mich.) and Joe Manchin III (D-W.Va.) comprise the list of key Democrats up for reelection from states won by Trump.

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