Donald Trump welcomed Fox News anchor Megyn Kelly back to the network on Monday the only way he knows how: with a series of insulting tweets.

Trump, who has been relentlessly criticizing Kelly since she moderated the first GOP presidential debate earlier this month, took the newswoman to task for taking some time off last week amid the controversy, and said that her show The Kelly File would be better off without her.

Trump was also apparently unimpressed with Kelly's interview with Dr. Cornel West Monday night. He tweeted that she seemed "afraid" and has "no clue" about immigration issues.

How to run for president, according to Donald Trump

In response to Trump's tweets, Kelly tweeted a picture outlining the Republican candidate's immigration platform, which includes building a wall on the U.S.-Mexico border and making Mexico pay for it.

Fox News Chairman Roger Ailes also defended Kelly. "Donald Trump's surprise and unprovoked attack on Megyn Kelly during her show last night is as unacceptable as it is disturbing," Ailes told CNNMoney in a statement Tuesday. (He also noted that Kelly's vacation was scheduled "well ahead of time," according to CNN Money.) Fox & Friends host Brian Kilmeade described Trump as "totally out of control" on Tuesday morning.

Several other Fox News staff members - including Trump's friend Geraldo Rivera - have also weighed in on the feud, taking Kelly's side.

What do you think of Trump's comments?