GOP frontrunner Donald Trump is capitalizing on Sen. Ted Cruz (R-TX) firing his communications director, Rick Tyler, by posting on Twitter about Cruz allegedly lying about him in a campaign advertisement.

After news broke that Cruz fired Tyler for posting a video wrongly portraying Sen. Marco Rubio (R-FL) and the Bible, Trump took to Twitter, reacting and calling Cruz a liar for an advertisement he’s using against Trump.

Wow, Ted Cruz falsely suggested Marco Rubio mocked the Bible and was just forced to fire his Communications Director. More dirty tricks! — Donald J. Trump (@realDonaldTrump) February 22, 2016

Ted Cruz has been playing an ad about me that is so ridiculously false – no basis in fact. Take ad down Ted. Biggest liar in politics! — Donald J. Trump (@realDonaldTrump) February 22, 2016

Ted Cruz has now apologized to Marco Rubio and Ben Carson for fraud and dirty tricks. No wonder he has lost Evangelical support! — Donald J. Trump (@realDonaldTrump) February 22, 2016

Just saw the phony ad by Cruz – totally false, more dirty tricks. He got caught in so many lies – is this man crazy? — Donald J. Trump (@realDonaldTrump) February 22, 2016

Ted Cruz should be disqualified from his fraudulent win in Iowa. Weak RNC and Republican leadership probably won't let this happen! Sad. — Donald J. Trump (@realDonaldTrump) February 22, 2016