Trump is expected to nominate retired Gen. James Mattis to head the Pentagon.
Mattis, a former Marine Corps general and Trump’s pick to lead the US military, has served as defense secretary for more than two decades.
He will also lead the State Department.
Mattis has been a vocal critic of Iran and its nuclear program.
He told Reuters in an interview that he thinks Iran will not get a bomb.
Trump said Mattis will be a good president for the United States.
“I like him,” Trump said in a statement.
“He has the guts and will to be tough on Iran.
He has a great temperament and will be the strongest and smartest person that we could have in charge of our military.
And I think he’s going to be a really great president for our country.”
The president has been critical of Iran’s pursuit of nuclear weapons and has made it clear that he is prepared to use military force to prevent Tehran from obtaining a nuclear weapon.
In his statement, Trump said Mattis has the “temperament and will” to be strong on Iran, and he praised Mattis for his service to the United State.
“He has a tremendous intellect and will bring tremendous experience to our military,” Trump added.
Mattis, the former Marine, has been Trump’s top choice to lead Defense.
He is a highly decorated combat veteran who served two tours in Iraq.
“It is my honor to nominate General James Mattis as our next Secretary of Defense, and I look forward to his extensive experience in the defense sector, which will be critical to our nation’s defense,” Trump told a crowd of more than 2,500 in the Rose Garden of the White House on Thursday night.
Mattes is a decorated Vietnam veteran who rose to the rank of general.
He served as commander of a Marine Expeditionary Unit that carried out the initial invasion of North Vietnam in 1972.
He was awarded the Bronze Star and Purple Heart for his efforts.
He also received a Purple Heart Medal and the Combat Action Badge for the Operation Desert Storm raid in 1967.
Mattis was also awarded the Medal of Honor for his actions during the 1973 Battle of Khe Sanh.
During his confirmation hearings, Mattis said he would fight to keep nuclear weapons.
“If there’s a nuclear war and we need to have the deterrent, I think we will,” Mattis said.
According to a recent report by The Washington Post, Trump has also considered nominating former Rep. Tom Price (R-Ga.), Trump’s nominee to lead Medicare and Medicaid.
The Post also reported that Trump has called for a reduction in the US Army to 30,000 and that he wants to make the National Guard the size of the National Rifle Association.