Last month, a friend of the wealthy conservative donor Rebekah Mercer arrived at Facebook’s Silicon Valley headquarters. His task: Find out what — if anything — could repair relations between Facebook, the world’s biggest social media company, and Cambridge Analytica, the voter-profiling firm co-founded by her father and used by the Trump campaign.
The revelation last month that Cambridge Analytica improperly acquired the private Facebook data of millions of users has set off government inquiries in Washington and London, plunging Facebook into crisis. But it has also battered the nascent political network overseen by Ms. Mercer, 44, and financed by her father, Robert Mercer, 71, a hard-line conservative billionaire.
Ms. Mercer’s standing in Mr. Trump’s circle had already declined following the departure last year of Stephen K. Bannon, her family’s former adviser and President Trump’s former chief strategist, according to Republicans with close ties to the president’s political operation. A pro-Trump advocacy group controlled by Ms. Mercer has gone silent following strategic disputes between her and other top donors. Plans to wage a civil war against the Republican establishment in the 2018 midterms have been derailed.
And last month, after reports on Cambridge in The New York Times, The Observer of London and The Guardian, Facebook banned the company from its platform, a major blow to any political or commercial targeting firm. Not a single American candidate or “super PAC” committee has reported payments to the company since the 2016 campaign, according to federal records.