Details of a whistle-blower’s complaint against President Donald Trump gave Democrats a roadmap on Thursday for their impeachment inquiry but left Republicans straining under the most serious test yet of their loyalty to the White House.

Trump impeachment inquiry: "The whistleblower is a CIA officer who worked at the White House."

Details of a whistle-blower’s complaint against President Donald Trump gave Democrats a roadmap on Thursday for their impeachment inquiry but left Republicans straining under the most serious test yet of their loyalty to the White House.