Former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE hit back at President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE on Sunday, accusing him of asking Ukraine to "manufacture lies" about him.

"In my experience, asking a foreign government to manufacture lies about your domestic political opponent is not “done all the time," Biden tweeted

In my experience, asking a foreign government to manufacture lies about your domestic political opponent is not “done all the time.” https://t.co/w8K8C17yUj — Joe Biden (@JoeBiden) October 6, 2019

Biden's post came in response to the president's tweet from Friday that said asking foreign governments for help is "done all the time."

As President I have an obligation to end CORRUPTION, even if that means requesting the help of a foreign country or countries. It is done all the time. This has NOTHING to do with politics or a political campaign against the Bidens. This does have to do with their corruption! — Donald J. Trump (@realDonaldTrump) October 4, 2019

The House has opened up an impeachment inquiry against Trump following revelations that the president asked Ukrainian President Volodymyr Zelensky to look into Biden and his son Hunter. The president's ask came days after he withheld military aid from the country.

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The president has insisted this was not a quid pro quo agreement, and the request was to uncover corrupt actions by Biden and his son. The former Ukrainian Prime Minister Mykola Azarov has said Biden's son did not violate Ukrainian law.