"I have not heard from any clerks in my district that there were irregularities in the process," GOP Congressman Fred Upton said.
Representative Justin Amash criticized attack ads targeting Democratic candidate Hillary Scholten as "particularly bad."
"President Trump does not have the power to unilaterally rewrite the payroll tax law," GOP Senator Ben Sasse said.
The Michigan independent congressman told his supporters Saturday that he will not enter the presidential race as a Libertarian.
The presumptive Democratic presidential nominee is in the lead in the key battleground states of Michigan, Wisconsin, Pennsylvania and Florida.
"If this election ends up being as close as 2016, even a small showing can have a crucial impact," said Patrick Murray of the Monmouth University Polling Institute.
Michigan Representative Justin Amash recently announced his bid for the 2020 presidential election and that decision may not bode well for President Donald Trump at the polls.
"I think we are at that crossroads where this kind of change can happen," the congressman from Michigan said, discussing his bid for the Libertarian Party's presidential nomination.
The U.S. representative from Michigan announced an exploratory committee for seeking the Libertarian Party nomination in the next election.
"Americans are ready for practical approaches based on humility and trust of the people," Amash said.
In a challenge to the president's most ardent supporters in Congress, several House members introduced a single-sentence resolution reaffirming that Trump, or any U.S. president, does not have total authority.
"Americans who believe in limited government deserve another option," Amash said.
"A crime is a crime, and all victims deserve equal justice," GOP Rep. Thomas Massie said. "Adding enhanced penalties for 'hate' tends to endanger other liberties such as freedom of speech."
The independent Michigan congressman joined several Republican lawmakers in blasting the strike on Iranian general Qassem Soleimani without Congress' approval.
In the wake of Jeff Van Drew's withdrawal from the Democratic Party and entry to the Republican Party, Justin Amash has remarked harshly upon Van Drew's declaration that Trump has his "undying support."
The independent congressman from Michigan was elected as a Republican, but formally withdrew from the political party in July.
Some Democrats believe that Amash, who left the GOP earlier this year, will be more effective than members of their own party in reaching conservative voters.
"They have decided to put party above the rule of law, party above what is right," Rep. Mike Quigley said.
"This president will be in power for only a short time, but excusing his misbehavior will forever tarnish your name," said Justin Amash, now an independent congressman.
"Hillary does—and did—drive many people into the arms of Donald Trump. Her attack on Tulsi does likewise," the Republican-turned-Independent congressman tweeted shortly after 1 a.m.
Amash, once a member of the conservative House Freedom Caucus, left the Republican Party in July and became an Independent after becoming the first and only member of his party to call for Trump's impeachment based on evidence from the Mueller report.
"President Trump's defenders mischaracterize the favor," independent Representative Justin Amash of Michigan said in a tweet.
"It is a betrayal of the office at the scale of which I haven't seen in my lifetime," the Democratic presidential candidate and senator said.
Newly Independent Michigan congressman Justin Amash said partisan dysfunction and corruption is "much worse" than Netflix's "House of Cards."
"You can't leave fast enough," President Donald Trump wrote on Twitter, referencing progressive Democratic congresswomen.
"I've been telling people, if we want to keep the Republican party in Texas, the Republican party in Texas needs to start looking like Texas," the Congressman said.
"I believe I have to use my skills, my public influence, where it serves the country best, and I believe I have to defend the Constitution in whichever way works best," said the Michigan congressman.
Impeachment continues to be a thorny topic for Democrats. For the most part, leaders of the party have argued that impeachment is a politically risky move.
"See you soon Justin..." Trump Jr. tweeted. "I hear Michigan is beautiful during primary season."
The trade deal requires approval of Congress, meaning Trump still needs to win over House Speaker Nancy Pelosi before the measure can pass—something tariffs with Mexico won't help. Now, even Republicans are expressing doubts.