WASHINGTON - President Donald Trump on Friday endorsed a tweet comparing the top Senate Democrat to Iran, the United States' longtime adversary, suggesting neither could be trusted, as Democratic leaders criticized the White House for ordering a military strike to kill a powerful Iranian commander without congressional input.

Iran's cyber troops long have been among the world's most capable and aggressive - disrupting banking, hacking oil companies, even trying to take control of a dam from afar - while typically stopping short of the most crippling possible actions, say experts on the country's capabilities.