Federal prosecutors are still pressuring the Federal Reserve over the Trump administration’s allegations that there was some malfeasance involved in ongoing building revelations and Chair Jerome Powell’s testimony to Congress about them. But legal experts say U.S. Attorney for the District of Columbia Jeanine Pirro’s investigation appears to be in trouble, and she faces a ticking clock to appeal a judge’s rulings against her.

Investigators from Pirro’s office visited a Fed construction site Tuesday, according to a note sent by the Fed’s legal team to the prosecutors and seen by CNBC. The investigators appeared “without prior notice” and asked for a tour, Robert Hur, an attorney for the Fed, wrote in the note.

“Any construction project that has cost overruns of almost 80% over the original construction budget deserves some serious review,” Pirro said in a statement to CNBC.

The investigators’ visit comes at a crucial juncture for Pirro’s investigation. James E. Boasberg, chief judge of the U.S. District Court for the District of Columbia, ruled last month that the prosecutors hadn’t met the low bar to seek a subpoena to the Fed. He quashed subpoenas Pirro’s office had issued, and on April 3 declined a request by the prosecutors to appeal the order.