You may remember that the gold bars found in his house were part of a 2013 armed robbery. The gold bars were tracked back to the armed robbery by their serial numbers.

His conviction, in part, labeled him as an agent for the Egyptian government. It seems he took his job as the (then) Chair of the Senate Foreign Relations Committee too seriously.

Here's a comical quote;

“This process is political and it’s corrupted to the core,” he added. “I hope President Trump cleans up the cesspool and restores the integrity to the system.”