New Delhi: Prime Minister Narendra Modi's jibe at the previous UPA government during his Canada trip, saying he would "clean up the dirt" left behind by them, was "regrettable" and "nothing less than disgraceful", Congress MP Shashi Tharoor said here on Sunday.

"Saying that abroad was not healthy. Political speechifying is normal in any democracy, but you do it at home. We have always held the view that our political differences should stop at the waters' edge. And that's why it was rather regrettable that the prime minister spoke in that way about his predecessors," Tharoor told IANS here.