President Trump has responded to an op-ed written by Sen.-elect Mitt Romney who aired some criticism of Trump's time in the White House.

"A president should demonstrate the essential qualities of honesty and integrity, and elevate the national discourse with comity and mutual respect. ... And it is in this province where the incumbent's shortfall has been most glaring," Romney wrote in the Washington Post.

"With the nation so divided, resentful and angry, presidential leadership in qualities of character is indispensable. And it is in this province where the incumbent’s shortfall has been most glaring.

"I do not intend to comment on every tweet or fault. But I will speak out against significant statements or actions that are divisive, racist, sexist, anti-immigrant, dishonest or destructive to democratic institutions," he continued.

But Trump has responded to Romney (as we all knew he would) in a tweet this Wednesday.

"Here we go with Mitt Romney, but so fast! Question will be, is he a Flake? I hope not. Would much prefer that Mitt focus on Border Security and so many other things where he can be helpful. I won big, and he didn’t. He should be happy for all Republicans. Be a TEAM player & WIN!" he tweeted.

Trump is finding himself increasingly under pressure. The government is now in its 11th day of the shutdown, and he is still demanding that the $5 billion wall be fully funded by the government - with taxpayers money.

During his 2016 election campaign, he promised that the wall would be paid for by Mexico, and not the U.S.