Last week, a claim went viral that Thompson set to testify against former House Speaker Nancy Pelosi regarding insider trading before his death on December 4.
Mangione is facing charges of murder and is being held without bail in Pennsylvania on charges related to guns and forgery, to which he has pleaded not guilty.
The Lorien Nursing and Rehab Center in Bel Air was accused of mistreating patients in multiple incidents, according to the Department of Health and Human Services (HHS).
The trip to Luxembourg, organized by Speaker Mike Johnson, R-La., was arranged to mark the anniversary of the battle with a bipartisan group of around 20 lawmakers.
Mangione fatally shot Thompson outside a Manhattan hotel last week, triggering a five-day manhunt that ended with his arrest at a McDonald's in Altoona, Pennsylvania, on Monday.
Wray, seven years into his 10-year term, was appointed by Trump in 2017 after the former president abruptly fired his predecessor, James Comey, cutting his tenure short.