Donald Trump’s personal attorney and former NYC mayor, Rudy Giuliani appeared to threaten to sue Fox News host Steve Hilton, for branding him as part of “the swamp.”

During the most recent broadcast of his “Next Revolution” Fox News show, Hilton, a frequent Trump supporter, confessed, “There’s a swamp going on with the commercial interest of Rudy Giuliani… He’s going around trying to make business deals out of the Ukraine situation, at the same time as acting for his client, President Trump. He’s trying to make money off his relationship with President Trump.”

Hilton then went on to call the former New York City mayor “toxic” and an “unethical disaster.”

In response, Giuliani tweeted that he was “outraged” by Hilton’s remarks, adding in another post, “Lawyers tell me @SteveHiltonx is a wild card and I should sue him for libel. He recklessly disregarded the truth!”

The former mayor who has been at the center of the Ukraine controversy, also tweeted, “I have not taken a penny for representing my friend, President Trump. I am outraged that @SteveHiltonx reported that I was trying to pursue private business deals in Ukraine to ‘enrich’ myself when in reality I have made ZERO in Ukraine! Very lazy reporting!”

Giuliani has also said in recent interviews, that since representing Trump, he has “considered and turned down all deals in Ukraine, even those not presenting a conflict.”

But, none of that spared the former mayor from Hilton’s unbridled rant.

“This week, we learn more disturbing details about Rudy’s role. It turns out that the former mayor’s own personal business interests are wrapped up in all of this,” he said. “To put it simply, he’s been trying to enrich himself on the back of his relationship with President Trump. And you know what, I’m just fed up with the lot of them.”

Hilton said Giuliani “was a great mayor and a great leader, but he’s turned into an unmitigated, and now it seems, unethical disaster.”

He also accused Giuliani’s associates of “taking advantage of the president to do dodgy deals in the world’s shadiest places.”

To which Giuliani tweeted in response, “If it wasn’t for me, @SteveHiltonx wouldn’t even be covering Burisma. He sure didn’t cover it for the THREE YEARS it was in front of his face. He should apologize for his maliciousness and thank me for the story!”