In a shakeup that's roiling Donald Trump's presidential campaign, the GOP front-runner told senior staffers at a Saturday meeting that he wants his recent hires Paul Manafort and Rick Wiley to take the reins in upcoming states, giving them a $20 million budget for key contests in May and June, according to three sources with knowledge of the meeting.

The spending authorization, which covers most of the month of May, is far more than the campaign has spent in any prior month, according to Federal Election Commission filings. The cash infusion — which the sources said is intended to fund an aggressive advertising push, as well as more staff at Trump's New York headquarters and in upcoming states — is part of an effort by the billionaire to expand and professionalize a shoestring operation that had mostly gotten by on the strength of free media exposure and a small core team.

But sources inside the Trump campaign said the moves are increasingly alienating staff loyal to the original team, headed by campaign manager Corey Lewandowski, which had guided Trump from the political fringe to the precipice of the GOP presidential nomination with relatively little campaign infrastructure or spending.