'He’ll probably go down as the worst president in the history of our country': Trump hits back at president Obama

US: US Republican party presidential candidate, Donald Trump has hit back at President Barack Obama after he describe him as 'unfit for presidency' with Trump saying the “terrible president” would go down as the worst in American history.

In an interview with Sinclair Broadcast group on Tuesday, Trump said;

“Well he’s a terrible president. He’ll probably go down as the worst president in the history of our country, he’s been a total disaster,”

“You look at what happens in the Middle East, in Syria and his line in the sand. I think it just means he’s concerned I’m going to win,” he said.

When asked about President Obama's statement, Trump said;

“Don’t forget last time he said I would never get the nomination, now he is saying I wouldn’t get the election now all of a sudden he said the other day maybe I can win the election, no I guess he probably has to say that kind of thing,”

President Obama had on Tuesday told reporters at a joint news conference with the Singapore prime minister; 

“I think the Republican nominee is unfit to serve as president. I said so last week and he keeps on proving it.”

Trump restated his stand, saying he does not regret criticizing the parents of a Pakistani-origin American Muslim soldier Humayun Khan who was killed by a suicide bomber in Iraq in 2004.

“I don’t regret anything. I said nice things about the son and I feel that very strongly but of course I was hit very hard from the stage and you know it’s just one of those things but no I don’t regret anything,” he said.

Trump said he also did not regret calling Democratic presidential candidate Hillary Clinton the devil.

“No, I don’t think so; I think it is what it is. She’s a very deceitful person, she lies, she cheats, no I don’t think that’s too far at all,” he said.

Trump said he retained his belief that the November 8 presidential election is rigged.

“I’m talking about at the voter booth. I mean we’ve seen a lot of things over the years and now without the voter ID’s and all the things going on and some bad court cases have come down,” Trump said.

“I just hear things and I just feel it and I felt it having to do with the primaries. I looked at Bernie sanders I said ‘he isn’t going to win. I thought this whole thing was rigged and I think the general election is gonna be, we’re gonna have a lot of problems we have to be very careful,” Trump said.