The chairman of the House Intelligence Committee expressed concern Sunday that special counsel Robert Mueller has not adequately scrutinized President Donald Trump’s finances and said House investigators plan to probe Trump’s relationship with a bank implicated in Russian money laundering.

“We are not interested in our committee in whether he’s a tax cheat or not worth what he says he is,” Rep. Adam B. Schiff, D-Calif., said in an appearance on the NBC’s “Meet the Press.” “What we are interested in is, does the president have business dealings with Russia such that it compromises the United States?”

In particular, Schiff said the House panel plans to investigate Trump’s two-decade relationship with Deutsche Bank, a German institution that has paid hundreds of millions of dollars in penalties in recent years after admitting its role in a $10 billion money laundering scheme that allowed clients in Russia to move vast sums overseas.

Schiff voiced concern that Mueller has shied away from investigating Trump’s ties to the German lender, saying that “if the special counsel hasn’t subpoenaed Deutsche Bank, he can’t be doing much of a money-laundering investigation.”

Schiff was referring to reports last year that Mueller’s office had told Trump’s lawyers it was not seeking Deutsche Bank records related to Trump’s accounts or loans. Deutsche Bank became a critical lender to Trump in the late 1990s when major U.S. banks refused to do business with the New York real estate developer after repeated bankruptcies.

Trump has described his finances as a “red line” Mueller should not cross, and he threatened to fire Mueller in late 2017 amid reports that the special counsel was seeking records from Deutsche Bank. Trump reportedly backed down after his lawyers obtained assurances from Mueller.

Schiff said he is concerned that Trump’s “red line has been enforced whether by the deputy attorney general (Rod Rosenstein) or by some other party at the Justice Department. But that leaves the country exposed.”

A spokesman for the special counsel did not respond to a request for comment.

The House intelligence committee has sought to bolster its investigative staff with financial and forensic accounting experts, part of an expansion of the Trump-Russia probe since Democrats gained control of the chamber.