Hillary Clinton Hillary Diane Rodham ClintonBloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close Trump pledges to make Juneteenth a federal holiday, designate KKK a terrorist group in pitch to Black voters MORE called out 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 Twitter for telling reporters that Ukraine and China should investigate 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 and his son Hunter Biden.

"Someone should inform the president that impeachable offenses committed on national television still count," she tweeted.

Someone should inform the president that impeachable offenses committed on national television still count. https://t.co/ABObD2Ie4S — Hillary Clinton (@HillaryClinton) October 3, 2019

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Clinton's tweet was in response to the president's encouragement of the two countries to investigate Biden and his son based on unsubstantiated assertions of corrupt behavior involving both countries.

“I would think that if they were honest about it they’d start a major investigation into the Bidens,” Trump said to reporters Thursday.

President Trump is already under scrutiny for asking Ukraine to "look into" Biden in a July 25 phone call with President Volodymyr Zelensky days after withholding military aid to the country.

News of the call blew up when Congress requested a whistleblower report that described the incident, which later prompted House Speaker Nancy Pelosi Nancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds MORE (D-Calif.) to launch an official impeachment inquiry.