Iran plot to kill Trump prompted Secret Service to boost protection before rally shooting

• The United States obtained intelligence about an Iranian plot to assassinate former President Donald Trump in recent weeks.
• That intelligence led the U.S. Secret Service to increase security around Trump, who is the Republican presidential nominee, the officials said.
• The intelligence and boosted security occurred before Trump was targeted Saturday in an attempted assassination by Thomas Crooks at a campaign rally in Pennsylvania.

The United States obtained intelligence about an Iranian plot to assassinate former President Donald Trump in recent weeks, three officials briefed on the matter told NBC News on Tuesday.

That intelligence led the U.S. Secret Service to increase security around Trump, who is the Republican presidential nominee, the officials said.

The intelligence and boosted security occurred before Trump was targeted in an attempted assassination by 20-year-old gunman Thomas Crooks at a campaign rally in Pennsylvania on Saturday.

CNN first reported the news of the Iranian plot, which raises more questions about the Secret Service's failure to prevent the shooting by Crooks.

National Security County spokeswoman Adrienne Watson in a statement said that law enforcement authorities investigating the shooting by Crooks have "not identified ties between the shooter and any accomplice or co-conspirator, foreign or domestic."

"As we have said many times, we have been tracking Iranian threats against former Trump administration officials for years, dating back to the last administration," Watson said.

" These threats arise from Iran's desire to seek revenge for the killing of Qassem Soleimani.  We consider this a national and homeland security matter of the highest priority," she said.

The Secret Service, which is