Mark Shields and Ramesh Ponnuru on Trump, Ukraine and 'quid pro quo'

Syndicated columnist Mark Shields and Ramesh Ponnuru of The National Review join Judy Woodruff to discuss the week’s political news, including President Trump’s insistence that foreign leaders should investigate the Biden family, how the White House is responding to the subsequent House investigation and the newest fundraising and poll numbers among 2020 Democrats.

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