U.S. Sen. Elizabeth Warren (D-Mass.) and Rep. Alexandria Ocasio-Cortez (D-N.Y.) have asked regulators to clarify their rules on former employees taking roles in the crypto industry.

In a letter sent to almost all federal financial regulators, the lawmakers noted "the increasing number of revolving door hires" and asked how long individuals involved in regulating the crypto industry are barred from seeking employment in it.

Along with their fellow signatories, the two say they are concerned that crypto firms may appoint former financial regulators and government officials to add some teeth to their lobbying efforts.

"We are concerned that the crypto revolving door risks corrupting the policymaking process and undermining the public’s trust in our financial regulators," the letter said.