The man suspected of sending the bombs kept a list of elected officials and others who investigators believe were intended targets.

Thirteen years ago, U.S. mail bomb suspect Cesar Sayoc never expressed racism or homophobia -- but that changed over the years.

Asked if he planned to tone down the partisan rhetoric at rallies, which his critics contend has deepened political divisions in the country, Trump replied: "I think I've been toned down. You know, I could really tone it up."

Federal law enforcement officials have arrested a person in connection with the suspicious packages that have been sent to prominent Democrats over the past week, according to reports.