Newly announced Donald Trump campaign manager Kellyanne Conway said that the changes announced Wednesday were less of a "shake-up" than an attempt to "beef up" senior staff positions as the presidential race enters the home stretch.

Appearing on Fox News, Conway touted the new changes, which saw her move from senior adviser to campaign manager and Breitbart News chief Stephen Bannon come on board as the campaign executive. She also defended campaign chairman Paul Manafort's role within the campaign, saying he's done an effective job in his position.

"There are many roles and responsibilities for each of us. There's so much to do between now and election day ... over the next 12 weeks. We're trying to expand the senior team in a way that allows us to meet those needs," Conway told hosts Bill Hemmer and Martha MacCallum.

"We want to deny Hilllary Clinton the Oval Office and make good on the promise to millions and millions and millions of Americans who have expressed their support for Donald Trump in the primaries and also in the general.

"We feel really good about expanding this team," she continued. "I know some are calling it a shake-up. It really is not. It doesn't feel that way," Conway said, explaining why the changes took place. "Because it's the busy home stretch through election day, and we just need to, sort of, beef up the senior level roles in a way that we are dividing and conquering. There's just a great deal to do."

Conway also told the hosts that the campaign will be beefing up their ground and data operations over the final 12 weeks of the race, while also giving Manafort and Rick Gates, his deputy, props for the job they have done.

"I think Paul Manafort as chairman and Rick Gates as deputy have done a phenomenal job in building out this campaign over that five-six months to put it in a place that's competitive going into the fall."

The announcement comes amid a downward spiral in the polls for Trump, who trails Clinton nationally and in key battleground polls, in some cases by double digits.