Former CIA Director John Brennan has a New Year's prediction: 2019 is about to usher in more political and legal problems for in President Trump.

"It is my sincere hope that the forthcoming exposure of your malfeasance & corruption will convince enough Republicans to abandon you in 2019. We have had enough of your whining from the White House. We need an actual leader—our Nation’s future is at stake," Brennan tweeted Monday.



It is my sincere hope that the forthcoming exposure of your malfeasance & corruption will convince enough Republicans to abandon you in 2019. We have had enough of your whining from the White House. We need an actual leader—our Nation’s future is at stake. https://t.co/dNzRGuOFdP — John O. Brennan (@JohnBrennan) December 31, 2018



Trump and Brennan have repeatedly clashed since the former real estate magnate and reality TV star was elected in 2016. Brennan, now an MSNBC pundit, in particular has criticized Trump's foreign and national security polices as they pertain to Russia, North Korea, Iran, and Israel.

"It is abnormal for us to speak out as critically and as vocally as we have, but these are abnormal times and he is an abnormal president. He's an aberration and not in a good way," Brennan said in June during a segment on his network. "As former national security officials and nonpartisans, we are very, very concerned that what we're seeing here is something that we have seen in other countries around the globe, which really led to the degradation of democratic principles as well as the standards of governance. That should not be happening here, this is the United States of America."

Tensions between the pair came to a head in August when the White House pulled Brennan's security clearance over his "erratic behavior."

Brennan's comments come as Trump's lead personal lawyer Rudy Giuliani reiterated his calls for special counsel Robert Mueller to complete his federal Russia investigation.

[Rudy Giuliani: Robert Mueller 'should be investigated, damn it']

"My ultimatum is put up or shut up, Bob. I mean, you know, what do you have? There are those of us who believe you don’t have anything on collusion. And by the way, if you did, it’s not a crime, so what the heck are you doing?" Giuliani told Fox News over the weekend.

Brennan served as CIA director from March 2013 to January 2017 under former President Barack Obama, prior to which he was Obama's national security adviser from 2009 to 2013. He was also acting director of the National Counterterrorism Center from 2004 to 2005 during the George W. Bush administration. In addition, Brennan worked as a CIA analyst under the George H.W. Bush presidency and gave former President Bill Clinton his daily intelligence briefing.