The sanctions came with a warning from President Donald Trump.
"Iran is playing with fire -- they don't appreciate how 'kind' President [Barack] Obama was to them. Not me!" he said.
On Thursday an Iranian frigate came within 150 yards of the Invincible.
On Saturday, A U.S. Navy surveillance ship was harassed by an Iranian fast attack craft while entering the Persian Gulf.
USNS Invincible (T-AGM-24) was transiting the Strait of Hormuz in the early morning on March 4 with three other coalition ships when the ships were approached by several Iranian Revolutionary Guard Corps Navy fast attack craft, the official told USNI News.
One of the IRGCN craft maneuvered 600 yards in front of the 2,300-ton Invincible and “went dead in the water,” the official said.