Sen. Lisa Murkowski of Alaska tweeted, "there is no excuse for the president’s spiteful comments – they were absolutely unacceptable and this needs to stop."
Sen. Susan Collins of Maine said in a statement: "the President's tweet that some members of Congress should go back to the 'places from which they came' was way over the line and he should take that down."
Sen. Tim Scott of South Carolina said in a statement: "The President interjected with unacceptable personal attacks and racially offensive language. No matter our political disagreements, aiming for the lowest common denominator will only divide our nation further."
Former Sen. Jeff Flake of Arizona tweeted: "There are times when the President's comments are so vile and offensive that it is incumbent on Republicans to respond and condemn. This is one of those times."
Rep. Fred Upton of Michigan wrote, "Frankly I’m appalled by the President's tweets. There’s no excuse. Inflammatory rhetoric from both sides of the aisle that is used to divide us just isn’t right. It’s not helpful."
Rep. Paul Mitchell, also of Michigan, tweeted: "@RealDonaldTrump, we must be better than comments like these. I share the political frustrations with some members of the other party, but these comments are beneath leaders."
Rep. Pete Olson, also of Texas, wrote, "The Tweet President Trump posted over the weekend about fellow Members of Congress are not reflective of the values of the 1,000,000+ people in Texas 22. We are proud to be the most diverse Congressional district in America. I urge our President immediately disavow his comments."
Rep. Mike Turner of Ohio wrote, "I am confident that every Member of Congress is a committed American. @realDonaldTrump’s tweets from this weekend were racist and he should apologize. We must work as a country to rise above hate, not enable it."