Washington - Trump's remarks came on a day when lawmakers questioned the rationale behind the Obama administration giving billions of dollars in aid to Pakistan without desired results.
Trump's remarks came during a town-hall meeting in Indianapolis in response to a question on how he would deal with countries like Pakistan, which has sometimes "double dealt" with the US.
"We've given them (Pakistan) money and they've double-dealt us," the interviewer from Fox News said.
"The problem with Pakistan -- I mean, they have nuclear weapons, and -- which is a real problem. Again, the single biggest problem, we have nuclear weapons ... But it's semi-unstable and we don't want to see total instability (in Pakistan)," Trump said.
Trump said the US has "a little bit of a good relationship" with Pakistan, and if he becomes the president, he will try to keep good relations with Islamabad.
"That's very much against my grain to say that, but, a country -- and that's always the country I think, if we give them money, we help them out, but if we don't, I think that would go on the other side of the ledger, and that could really be a disaster," Trump said.
However, the presidential aspirant did not specify what "disaster" he was talking about.
"At the same time, if you look at India and some of the others, maybe they will be helping us out, because we're going to look at it," Trump said.
Trump's remarks came on a day when lawmakers questioned the rationale behind the Obama administration giving billions of dollars in aid to Pakistan without desired results.