Jeb Bush, once a front-runner for the Republican presidential nomination, is implementing an across-the-board pay cut for his struggling campaign, removing some senior staff from the payroll, and canceling some fundraisers as the former Florida governor attempts a mid-campaign course correction 100 days out from the party’s first nominating contest.

The campaign is parting ways with some consultants and downsizing its staff at their Miami headquarters in moves that will save more than $1 million per month and cut payroll by 40 percent this week, according to Bush campaign officials who requested anonymity to speak about internal changes.

The campaign is also cutting back 45 percent of its budget, except for dollars earmarked for TV advertising and spending for voter contacts, such as phone calls and mailers. Some senior-level staff and consultants will continue to work with the campaign on a volunteer basis, while other junior-level consultants, primarily in finance but including other areas, will be let go, the officials said. The officials declined to say who would be removed from the payroll or provide an exact dollar figure for the savings.

Analysts and rival campaigns will view the changes as a desperate act, perhaps the last one, of a man whose campaign has dropped in the polls in recent months and has remained mired in the middle of a crowded field despite a month-long blitz of friendly television ads. None of the changes deal directly with what even many of Bush's supporters say is his main challenge: The burden of trying to convince voters hungry for change to choose a man whose father and brother both served as president.