Vice President Mike Pence on Sunday refused to say whether he believes U.S. officials were lying in testimony bolstering the case that President Donald Trump pressured Ukraine to investigate his political rivals in exchange for his administration's support.

CBS "Face the Nation" moderator Margaret Brennan repeatedly asked Pence about statements made by officials under oath that they had knowledge of a deal being offered that made military aid contingent on Ukraine opening an investigation targeting former Vice President Joe Biden.

House Democrats have been gathering the testimony as part of an impeachment inquiry. Pence was pressed on the matter Sunday after U.S. diplomat William Taylor told House investigators that Trump tried to withhold military aid and refuse a White House meeting with Ukraine's president as part of the effort.

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