Former San Francisco Mayor Willie Brown said in a new op-ed that people should not bet that impeachment will be a winner for Democrats.

Brown, in a column in the San Francisco Chronicle, said that the House’s vote last Thursday to approve the impeachment inquiry process “solidified” President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE’s “hold on power,” noting that all GOP representatives voted against the measure.

He also said the Democrats’ effort resulted in “Mission Unaccomplished.”

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“There were zero GOP defections, meaning we have zero drama heading into the public phase of impeachment,” Brown wrote. “Everyone is pretty much in the same lanes they’ve been in since the Russian-collusion investigation, the obstruction of justice investigation and every other investigation.”

The former mayor argued that most of the narrative surrounding the impeachment inquiry is already public, giving “people little reason to be glued to their screens” during upcoming public testimony. He also said people have made up their minds about Trump’s interactions with Ukraine's president.

“So the Democrats will spend the next few precious months acting out a pretend cliffhanger to which everyone actually knows the script and the ending,” he wrote. “No plot twists in sight.”

He also criticized House Democrats for abandoning the fight for affordable health care, the top issue for many of the party's voters in the 2018 midterms.

The House approved the impeachment inquiry process along party lines. The initial stage of the inquiry involved testimony from former and current Trump officials behind closed doors in front of the House Intelligence, Foreign Affairs and Oversight and Reform committees.

Trump and other Republicans have blasted the Democrats for starting the inquiry in private.

Speaker Nancy Pelosi Nancy PelosiPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Trump signs largely symbolic pre-existing conditions order amid lawsuit MORE (D-Calif.) announced the impeachment inquiry in September after a whistleblower complained that president asked the Ukrainian president to investigate former Vice President Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE and his son in a phone call. Trump’s request came days after he directed military aid to Ukraine be withheld. Trump has said repeatedly that he did nothing wrong.