Washington (CNN) After a week of revelations that suggest Michael Cohen may have turned on Donald Trump, Rudy Giuliani, the President's current lawyer, argued that Trump's former attorney wasn't credible and has "lied all his life."

That's a stark reversal from what Giuliani once said about Cohen, whom he described as truthful not long ago.

In May, Giuliani said that Cohen was "honest," and just a few weeks ago he said he didn't think Cohen would lie, saying, "I think he is going to tell the truth."

Giuliani's shifting statements on Cohen

The criticism Giuliani is now leveling at Cohen follows a series of reports that have led the President to lash out at his former lawyer.