Among Democratic presidential hopefuls appearing on the Sunday shows, the Hawaii congresswoman Tulsi Gabbard, a military veteran, told ABC's This Week Trump was "leading us down this risky path towards a war in Iran".
A senior Iranian military commander was quoted in local media saying his country is not looking for war.
Britain is warning Iran against provoking the White House.
As tensions escalate between the US and Iran, there have been concerns that Baghdad could once again get caught in the middle, just as it is on the path to recovery.
Jeremy Hunt told journalists in Geneva on Monday that USA leaders "are not seeking a conflict, they don't want a war with Iran, but if American interests are attacked, they will retaliate".
Energy ministers from OPEC and its allies, including major producers Saudi Arabia and Russian Federation, are meeting in Saudi Arabia on Sunday to discuss energy prices and production cuts.
Uber shares fall for second day after ill-fated IPO; Lyft follows
First, the timing of Uber's IPO coincided with a general "risk off" pivot amid Sino-American trade war concerns, she said. Its shares have been in a free-fall since debuting in late March, trading down 29% from its IPO price of $72.
Trump, in an interview with Fox News recorded last week and broadcast Sunday, said he does not "want to fight" but that when it comes to Iran, "you can't let them have nuclear weapons". That was followed last week by so far unexplained sabotage attacks against four vessels, including two Saudi oil tankers, heading toward the Gulf and a drone attack by Iran-backed Yemeni rebels against Saudi pumping stations, which forced the temporary suspension of an east-west pipeline.
The South Carolina Republican, one of the president's most dutiful supporters, fired off his bellicose tweet after getting a briefing from National Security Adviser John Bolton, an Iran hawk who has long argued for regime change in the country.
Both the semi-official Fars and Tasnim news agencies reported on the increased production of enriched uranium. "Never threaten the United States again", Trump tweeted.
"Going to war with Iran?" the Republican senator from Utah asked on CNN's State of the Union.
On Sunday, a Katyusha rocket was sacked into Baghdad's Green Zone housing government offices and embassies including the USA mission.
Iranian President Hassan Rouhani announced two weeks ago he was pulling out of part of the nuclear deal and would restart some uranium enrichment if there were no economic benefits by early July.
Following Sunday evening's events, prominent Iraqi Shiite cleric Muqtada al-Sadr and several other Iraqi politicians warned against dragging Baghdad into a conflict between Iran and the United States.
Sri Lanka imposes curfew, blocks social media amid violence
Unlike after the Negombo clashes, the Sri Lankan government did not impose a ban on social media platforms on Sunday. There were 200 Muslim religious preachers (Maulvis) among the ones deported , the media report said.
"Iranians have stood tall for millennia while aggressors all gone", Zarif wrote.
The limitations were meant to ensure Iran does not develop nuclear weapons, something Iran denied it had been doing.
Mohammad Javad Zarif posted his own message on Monday on Twitter, saying Trump had been "goaded" into "genocidal taunts".
"I would say to the Iranians, do not underestimate the resolve of the U.S side in this situation", stated British Foreign Minister Jeremy Hunt. Oman long has served as a Western backchannel to Tehran and the sultanate hosted the secret talks between the USA and Oman that laid the groundwork for the nuclear deal negotiations. He also has said he hopes Iran calls him and engages in negotiations.
Yousuf bin Alawi bin Abdullah discussed regional and global issues with Zarif, Iranian state news agency IRNA said.
Between the two cities is Mecca, home to the cube-shaped Kaaba that Muslims pray toward five times a day.
Why Missandei's death on Game Of Thrones felt particularly problematic
Yet each brutal maneuver that bought her a bit more time or power also cost her allies until the queen was alone and overrun. Arya survived the episode, but Jaime and Cersei did not - in a move that was also destined from the beginning of the series.