President Donald Trump has accused former President George Bush Jr. of committing "the worst single mistake ever made in the history of our country."

Trump’s remarks were made during an interview with The Hill on Wednesday, where he asserted that "going into the Middle East" was the worst mistake ever made in US history.

Trump noted that former President Barack Obama was wrong to withdraw the American Army from Iraq, but that meddling in the Gulf country in the first place was a “huge mistake,” as the US lost more than $7 trillion in that war, in addition to the hundreds of thousands of Americans and Iraqis who lost their lives during the years-long war.

“Because we spent $7 trillion in the Middle East," the president said. "Now if you wanna fix a window some place they say, 'Oh gee, let’s not do it.' Seven trillion, and millions of lives — you know, ‘cause I like to count both sides. Millions of lives.”

During the interview, Trump appeared to compare the American Civil War with Bush’s costly decision to invade Iraq and Afghanistan.

“To me, it's the worst single mistake made in the history of our country. Civil War you can understand. Civil War, Civil War. That’s different," the president continued. "For us to have gone into the Middle East, and that was just, that was a bad day for this country, I will tell you.”