Former Ohio Gov. John Kasich (R) said Friday that 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's remarks the day before calling for China to initiate an investigation into 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 were "deeply" disturbing, and urged Congress to probe Trump's contacts with foreign leaders thoroughly.

In a tweet, the former GOP presidential contender joined a small number of Republicans who have denounced Trump's call for China, traditionally a U.S. adversary, to initiate an investigation that could affect the 2020 election.

.@realdonaldtrump’s contact with China leaves me deeply disturbed especially on top of all the Ukranian developments. All of this demands a full and complete investigation, then let the chips fall where they may. — John Kasich (@JohnKasich) October 4, 2019

Kasich also questioned in a CNN interview on Friday afternoon why more Republicans were not coming forward to denounce the president's recent public statements calling for foreign investigations into Biden, a top 2020 candidate for president.

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"The investigation should continue, the inquiry should continue," he said on CNN, referring to House Democrats' impeachment investigation into Trump.

"This whole business of the president trying to get the Chinese to get in the middle of this and conduct and investigation against Biden is just shocking, frankly," Kasich said.

Republicans, he added, “need to look themselves in the mirror and understand why they're not willing to say anything” about the growing scandal.

House Democrats announced last week that an impeachment inquiry would investigate the president's contacts with Ukrainian President Volodymyr Zelensky, whom Trump advised during a July phone call to launch an investigation into Biden. The call came shortly after Trump delayed the delivery of hundreds of millions of dollars in military aid to Ukraine.

Trump has denied any wrongdoing.