Plus, the Secret Service said it has opened over 10,000 investigations into threats on its protectees so far this year, a 40% increase from the same time last year.

The increase is stretching Secret Service resources as agents devote more time to investigating threats against senior officials.

Plus, the Secret Service said it has opened over 10,000 investigations into threats on its protectees so far this year, a 40% increase from the same time last year.