David M Jackson

USA TODAY

A day after a major campaign shake-up, Donald Trump announced a series of hires on Tuesday.

Their duties include a focus of battleground states, human resources, digital communication and coordination of campaign surrogates.

“I continue to build a team of great people that will ensure we win in November," Trump said in a statement. "I have received more votes than any Republican in the history of the party and I am confident that, along with my team, we will take our movement to the White House and Make America Great Again.”

On Monday, Trump fired campaign manager Corey Lewandowski. One of the reasons, advisers said, was that Lewandowski blocked new hires for a campaign that many people believe is inadequately staffed for a general election.

Among the new hires, the campaign announced:

• Jim Murphy as national political director, focusing on the campaign’s key battleground states.

• Lucia Castellano as director of human resources.

• Brad Parscale to head the Trump campaign's digital team. Parscale has already been tweeting out Trump campaign statements for weeks.

• Kevin Kellems as director of surrogates.

Trump has "also added staff to the Communications Division to expand its research and rapid response capabilities," the campaign said in a statement. "More hires in this department are expected to be announced as the campaign continues to grow prior to the convention in July."