Top aides to former House Speaker Newt Gingrich have resigned en masse, Fox News has learned, imperiling the Republican’s 2012 presidential campaign at a crucial time.

Among the senior staff members Gingrich is losing are spokesman Rick Tyler and campaign manager Rob Johnson, along with other strategists. Insiders say Gingrich and senior aides were unable to agree on the direction of the campaign.

On his Facebook page Thursday afternoon, Gingrich assured supporters he remains in the race.

“I am committed to running the substantive, solutions-oriented campaign I set out to run earlier this spring. The campaign begins anew Sunday in Los Angeles,” he wrote, referring to a foreign policy address he’s scheduled to deliver Sunday evening.

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