Story highlights One senior campaign source says Brookover and Manafort "never saw eye-to-eye"

(CNN) Donald Trump's campaign fired one of its senior advisers on Monday, multiples sources confirmed to CNN.

Ed Brookover, who helped manage the campaign's delegate operations in the lead up to the Republican National Convention, was fired a little more than six weeks after he was promoted as the campaign's liaison to the Republican National Committee.

The firing comes even as the campaign continues to hire more staff in an effort to build up its political operation less than 100 days before the general election.

"The campaign has parted ways with Ed, but we are thankful to him for his many contributions and appreciate his continued support," the campaign said in a statement.

Two Trump campaign aides, Bill McGinley and Mike McSherry, who are both close to Trump's chief strategist and campaign chairman Paul Manafort, are set to take on expanded roles in the campaign, a senior Trump campaign source told CNN.

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