UPDATE: A source inside the Maes campaign tells CNN the embattled Republican nominee has decided to stay in the Colorado governor's race, despite increased pressure today for him to drop out.
(CNN) – Colorado Senate candidate Ken Buck is calling on fellow Republican Dan Maes to quit his bid for governor, the latest in a string of Colorado Republicans calling on the Tea Party favorite to step down before he is officially certified as the party's nominee later Friday.
"After having a lengthy conversation with Dan Maes, it is clear to me that Dan is struggling to determine the best path for his campaign, his family and for Colorado," said Buck in a statement. "I have decided that I can no longer support his candidacy for governor of Colorado."
Buck's statement comes after revelations Maes had embellished his resume about his business background and accused a Denver bike-sharing program of being an undercover plot orchestrated by the United Nations to advance an environmentalist agenda.
Maes – a Tea Party favorite who beat the establishment candidate and former U.S. Rep. Scott McInnis in the GOP primary last month – is facing calls to resign from several state Republican leaders as well as two of the state's major newspapers.
If Maes does not resign before he is officially certified the winner at 7 p.m. ET, Republicans have little chance of removing him from the ballot.