President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE said Wednesday that he was concerned for the safety of first lady Melania Trump Melania TrumpThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power FBI director casts doubt on concerns over mail-in voting fraud Trump: 'We could hardly hear' boos, chanting at Supreme Court MORE when making an unannounced trip to visit U.S. troops in Iraq for the Christmas holiday.

“I had concerns about the institution of the presidency. Not for myself personally. I had concerns for the first lady, I will tell you,” Trump told reporters shortly after landing at the Al Asad Airbase west of Baghdad.

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“But if you would have [seen] what we had to go through in the darkened plane with all window[s] closed with no light anywhere. Pitch black. I’ve been on many airplanes. All types and shapes and sizes,” Trump added. “So did I have a concern? Yes, I had a concern.”

The president and first lady departed Washington late Tuesday to make a previously unannounced trip to visit American forces in Iraq, where Trump met with military leaders and delivered remarks to roughly 100 U.S. troops involved in combat operations in Iraq and Syria. Details of the trip were kept under wraps until Wednesday afternoon.

Wednesday's trip was Trump’s first to a combat zone in his nearly two years in the White House. He had previously faced scrutiny from critics for not visiting a combat zone since becoming president.

"I want to come and pay my respects most importantly to the great soldiers, great troopers we have here," Trump said Wednesday.

It has been routine practice for presidents to visit combat zones around the holidays, and Trump appeared to concede Wednesday that his personal safety was one thing that kept him from visiting combat zones.

The president also said previous attempted visits were canceled for “security reasons” because “people were finding out” he was planning to go.

First ladies have also previously taken trips to war-torn areas. Then-first lady Laura Bush, for instance, visited Afghanistan in 2005 to meet with Afghan women and U.S. troops.