Robert Mueller, the special counsel overseeing the investigation into Russia, is now following the money.

That bodes as very problematic for Donald Trump and everyone connected to the “president”. Trump has long been believed to be in serious debt, controlled by Russian banks and investors. His long-standing soft spot for all things Russia has always raised eyebrows and pointed to the possibility of financial dependence on the part of Trump.

Federal investigators exploring whether Donald Trump’s campaign colluded with Russian spies have seized on Trump and his associates’ financial ties to Russia as one of the most fertile avenues for moving their probe forward, according to people familiar with the investigation.

The web of financial ties could offer a more concrete path toward potential prosecution than the broader and murkier questions of collusion in the 2016 campaign, these sources said.

One year after the FBI opened an investigation, the probe is now managed by special counsel Robert Mueller. Sources described an investigation that has widened to focus on possible financial crimes, some unconnected to the 2016 elections, alongside the ongoing scrutiny of possible illegal coordination with Russian spy agencies and alleged attempts by President Donald Trump and others to obstruct the FBI investigation. Even investigative leads that have nothing to do with Russia but involve Trump associates are being referred to the special counsel to encourage subjects of the investigation to cooperate, according to two law enforcement sources. – CNN

Trump has been nervous for some time that Mueller would turn his attention to the money. In fact he levied a not so veiled threat in an interview with the New York Times.

SCHMIDT: Last thing, if Mueller was looking at your finances and your family finances, unrelated to Russia — is that a red line?

HABERMAN: Would that be a breach of what his actual charge is?

TRUMP: I would say yeah. I would say yes. By the way, I would say, I don’t — I don’t — I mean, it’s possible there’s a condo or something, so, you know, I sell a lot of condo units, and somebody from Russia buys a condo, who knows? I don’t make money from Russia. In fact, I put out a letter saying that I don’t make — from one of the most highly respected law firms, accounting firms. I don’t have buildings in Russia. They said I own buildings in Russia. I don’t. They said I made money from Russia. I don’t. It’s not my thing. I don’t, I don’t do that. Over the years, I’ve looked at maybe doing a deal in Russia, but I never did one. Other than I held the Miss Universe pageant there eight, nine years. – NY Times

There have been rumors for weeks that Trump is looking for a reason to fire Mueller. The fact that he is now crossing Trump’s red line raises the stakes. What will Trump do next is anyone’s guess.