President Joe Biden and first lady Jill Biden in a video message on Monday told those affected by Hurricane Helene that "we grieve with you” and "the nation has your back."

The Bidens said the Federal Emergency Management Agency was working to help those in need across several states.

"FEMA is knocking on doors to sign up survivors for direct and immediate financial aid, because many of them need it now," the president said. "And I've directed my team to stay there 24/7 with you, until this job is done."

The storm made landfall in Florida last week as a massive Category 4 hurricane. As it moved through the southeastern United States it killed some 230 people, The Associated Press reported, with hundreds of others still unaccounted for.

The storm, which was the deadliest mainland hurricane since Katrina in 2005, churned through Florida, Georgia, North Carolina, South Carolina, Virginia, Tennessee and Alabama.

Officials in Buncombe County, North Carolina, said Sunday their primary search is 90% complete.

At a news conference, officials said they are using K-9 units as they search piles of debris for victims in the search and recovery operation. Fourteen urban search and rescue teams, including eight federal, are actively searching the area, officials said.

Most of the roads -- an estimated 90% -- are open to emergency vehicles, authorities said at the briefing.

The Army Corps of Engineers is helping to work on the damaged water infrastructure along with 160 city water employees in Asheville, and four contractors, according to officials.

-ABC News' Bill Hutchinson

The death toll from Hurricane Helene inched past 230 people on Saturday, The Associated Press reported.

The grim task of recovering bodies continued more than a week after the monster storm ravaged the southeast, killing people in six states.

The number of deaths stood at 225 on Friday; two more were recorded in South Carolina the following day.

It was still unclear how many people were unaccounted for or missing, and the toll could rise even higher.

-ABC News’ Victoria Arancio

President Joe Biden has ordered the deployment of 500 more troops to western North Carolina to aid in Hurricane Helene recovery efforts, he announced in a statement Sunday.

Earlier this week, Biden ordered 1,000 active-duty service members to be deployed to the area. According to the White House statement, the Biden administration has sent more than $137 million in federal funding to aid in recovery efforts, "with more to come."

"With a total of 1,500 troops now supplementing a robust on-the-ground effort -- including more than 6,100 National Guardsmen and more than 7,000 Federal personnel -- my Administration is sparing no resource to support families as they begin their road to rebuilding," Biden said.

According to Pentagon Press Secretary Maj. Gen. Pat Ryder, these soldiers are working with FEMA, the National Guard and state officials to support North Carolina by helping distribute commodities and clearing emergency routes.

Tennessee native Dolly Parton has pledged a $1 million donation to Hurricane Helene victims.

"These are my mountains … these are my rivers," she told community members gathered in a Newport, Tennessee, Walmart parking lot on Friday.

Helene "was devastating," Parton said. "Not just because it was my family, because all these people feel like my people. We all feel related, and we are in some sort of way. So it just devastated me, just to know that we had suffering like that. So anything we can do to help."

Parton's businesses in east Tennessee -- Dollywood Parks & Resorts, Dolly Parton’s Stampede, and Pirates Voyage Dinner & Show -- as well as The Dollywood Foundation are combining efforts to match Parton’s donation with their own $1 million contribution.

"You just try to step up. God has been good to me and so has the public. And I feel like anything I can do to give back and do what I can, I’m always willing to do that," Parton said as the crowd applauded.

"We are with you, we love you, we hope that things get better real soon, and we’re gonna do our part," she said.

Walmart also announced a $10 million donation to relief efforts.

-ABC News’ Jianna Cousin