Retired Admiral William McRaven also said that hawks in Washington should not think a conflict with Iran would be quick and painless.
U.S. President Donald Trump suggested he is ready to unleash the full power of the American military on Iran and "they know that."
Trump may not court a war, but he is doing too little to avoid one. He needs to act fast.
Experts warn that as well as Brexit, Iran is the first major foreign policy problem for Johnson, whom the U.S. president has lavishly praised.
"I remember it clearly that Mr. Pompeo said in public in a speech at Texas University that 'we lie, cheat and steal, and this is the glory of experiment of America,'" a Chinese Foreign Ministry spokesperson said.
The United States is deploying fighter jets and Patriot missiles just south of Riyadh to bolster defense against future Iranian threats.
President Donald Trump said Thursday that the USS Boxer has destroyed an Iranian drone in self-defense.
Javad Zarif hit out at the U.S., claiming Iran has only built a potent military because America is arming its rivals.
Foreign Minister Javad Zarif gave an interview in New York City, where he is under tight visa restrictions, during a visit to the United Nations.
Johnson is expected to win the contest to replace outgoing Prime Minister Theresa May at the end of July.
Movements of Iran's top diplomat Mohammad Javad Zarif and his delegation will be tightly curtailed.
"It's not news that the U.S. and UK differ in how to ensure Iran is never able to acquire a nuclear weapon," a spokesman for the UK Foreign Office said.
Relations between London and Tehran have been deteriorating after Britain seized an Iranian tanker off Gibraltar last week.
With Tehran's demanded sanction relief nowhere in sight, the United States must assume time is again running out to prevent a nuclear Iran.
Russia has repeatedly criticized President Donald Trump's administration for its aggressive stance towards Tehran.
The Islamic Revolutionary Guard Corps said its crews had been conducting routine naval patrols and interacted with no foreign vessels.
Iran President Hassan Rouhani said the United Kingdom will face "consequences" for its seizure of an Iranian supertanker off Gibraltar last week.
The Senator said that Trump and his administration had "ripped up" the nuclear deal "knowing that Iran would proceed as it is."
President Donald Trump said Sunday Iran had "better be careful" with its expansion of enriched uranium production.
"Trump needs to know that as long as he speaks the language of coercion with a civilized nation, they will only grow closer and more unified," Iran's Parliament Speaker Ali Larijani said.
The people never held to account for their warmongering in Iraq are now driving U.S. policy against Iran. They can't be allowed to drag us into another war.
A leading opponent to the Iran nuclear deal, Israel has now threatened to go to war if Tehran does not abide by its restrictions.
Nearly all of the Iranian economy is now sanctioned, with little real effect. It's time for statesmanship and prudence, not chest-puffing and bellicosity.
An attempt by the European Union to keep Iran in compliance with a 2015 nuclear deal may have fallen short.
"Iranian people have proved over the past 40 years that they are ready to pay for safeguarding national identity, territorial integrity, freedom, independence and Islamic establishment," Masoumeh Ebtekar said.
Foreign Minister Sergey Lavrov said a military conflict between Washington and Tehran would be an "international crisis."
"You have other bad leaders in the world, but they don't finance terrorism. They're not involved in terrorism," UN Ambassador Danny Danon said.
Trump put out a warning tweet to Iran on Tuesday, threatening "overwhelming force" and "obliteration."
"How can we start a dialogue with an administration who is threatening Iran?" asked Majid Takht Ravanchi.