Washington (CNN) President Donald Trump asserted on Thursday that he has the "absolute right" to ask "other Countries" to investigate corruption amid escalating scrutiny over his interactions with foreign leaders.

"As the President of the United States, I have an absolute right, perhaps even a duty, to investigate, or have investigated, CORRUPTION, and that would include asking, or suggesting, other Countries to help us out!" Trump tweeted.

"This isn't about a Campaign," he added in a separate tweet, "this is about Corruption on a massive scale!"

There is no evidence of wrongdoing in Ukraine by Joe or Hunter Biden.

Read More