Story highlights GOP megadonor Sheldon Adelson on Friday endorsed Donald Trump in an op-ed

Trump's campaign on Friday also touted the support of nine House committee chairmen who have endorsed him

The news comes a day after Trump met with top congressional Republicans in Washington on Thursday

Washington (CNN) GOP megadonor Sheldon Adelson on Friday lined up behind Donald Trump, endorsing the presumptive Republican nominee in an op-ed.

Adelson's endorsement -- a powerful call for Republican unity -- followed Trump's visit to Washington on Thursday where he worked to smooth relations with top congressional Republicans.

"You may not like Trump's style or what he says on Twitter, but this country needs strong executive leadership more today than at almost any point in its history," Adelson wrote in The Washington Post. "I am endorsing Trump's bid for president and strongly encourage my fellow Republicans — especially our Republican elected officials, party loyalists and operatives, and those who provide important financial backing — to do the same."

Adelson's op-ed did not detail how much he will spend to boost the GOP nominee.

Trump called Adelson's backing "an incredible honor" coming from "a person I have such tremendous respect for."

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