Lawmakers are probing the relationship between the U.S.’ head commodities regulator and FTX founder Sam Bankman-Fried. 

In a letter sent on Monday to Commodity Futures Trading Commission (CFTC) Chair Rostin Behnam, U.S. Sens. Elizabeth Warren (D-Mass.) and Chuck Grassley (R-Iowa) requested documents pertaining to the regulator's correspondence with Bankman-Fried. According to the letter, the request is to determine the nature of Behnham’s relationship with the crypto CEO. 

“Safeguarding the savings and retirements of Americans requires Congress and market regulators like the CFTC to determine how this multi-billion-dollar crime was allowed to happen,” the senators said in the letter. 

According to the request, Behnam has until April 29 to hand over records of his …