Rep. Steve King (R-Iowa) said Tuesday that Congress should slow down on immigration reform in the wake of the Boston Marathon terrorist attack in case rumors that it was conducted by a foreign national turn out to be true.

“Some of the speculation that has come out is that yes, it was a foreign national and, speculating here, that it was potentially a person on a student visa,” King told the National Review in an interview. “If that’s the case, then we need to take a look at the big picture.”

At least three people were killed and more than 100 were injured Monday when two explosive devices detonated near the finish line of the 117th running of the Boston Marathon. The White House is calling the bombing “an act of terror,” although the identity and motives of the terrorist or terrorists are unknown.