On Megyn Kelly’s first night back from an 11-day vacation, Republican presidential candidate Donald Trump launched an unprovoked Twitter attack against the Fox host, reported CBS News.

Fox News CEO Roger Ailes came to Kelly’s defense and demanded an apology from Trump, responding with a statement:

Donald Trump’s surprise and unprovoked attack on Megyn Kelly during her show last night is as unacceptable as it is disturbing. Megyn Kelly represents the very best of American journalism and all of us at FOX News Channel reject the crude and irresponsible attempts to suggest otherwise.

The war between Trump and Fox News seems to be back to 100 percent. Ailes came out strong against Trump, but will the network CEO buckle like last time? We know the arrogant Donald Trump won’t back down.