The officials, who spoke to Reuters on May 22 on condition of anonymity, said U.S. Central Command made the request, but added that it was unclear whether the Defense Department would approve it.
"What we're looking at is: Are there things that we can do to enhance force protection in the Middle East?" he told reporters at the Pentagon, ahead of a meeting with Vietnamese Foreign Minister Pham Binh Minh on Wednesday.
Shanahan dismissed reports that the United States was preparing to send as many as 5,000 or 10,000 more forces to the region.
However, he did say the plans may still include more troops. During back-to-back closed briefings for the House and Senate on Tuesday, defense leaders told congressional officials the U.S. doesn't want to go to war with Iran and wants to de-escalate the situation.
On Monday, an Iranian energy official announced the country has increased its uranium enrichment fourfold and informed the International Atomic Energy Agency.
According to warfare expert, Global Fire Power (GFP), Iran has the second largest military in the Middle East and is ranked 14th out of the 137 ranked nations analysed.
Trump has warned that Iran would be met with "great force" if it attacked USA interests in the Middle East.
Out-of-Control Wildfire Forces Evacuations in Canada
The evacuees were told to prepare for three days away from their homes and Kenney said they could be out for as many as five days. A wildfire burning south of the Town of High Level has jumped a highway, prompting warnings from fire officials.
The rocket attack came days after the State Department announced it was ordering all "non-emergency USA government employees" to leave Iraq as a result of tensions with Iran. Speaking to reporters at the Pentagon on Thursday, he said his focus is on determining "the right force protection" in the region.
The public of course hasn't been privy to any solid intelligence on any of that, but the reality that the Pentagon is as much in the dark as the rest of us really damages the credibility of hawks claiming secret intelligence of Iranian threats.
Shanahan said at the Pentagon.
US officials said the Iranian threat to USA forces continues even as Iran has pulled back some weapons systems.
Additionally, U.S. officials said an Iranian-backed group could be responsible for a rocket fired Sunday into the fortified Green Zone in Baghdad that caused injuries near the U.S. Embassy.
Asked more broadly about the reported uptick in foreign delegations visiting Iran and whether the usa is using them to communicate with Tehran, Ortagus said she was not aware of reports of an increase in foreign delegations to Iran.