Nancy Guthrie live updates: More than 1 suspect not ruled out, sheriff's office says

The Pima County Sheriff’s Department said it's possible the suspect in Nancy Guthrie's kidnapping may have purchased the clothes he’s seen wearing on the surveillance camera at Walmart, but that clothing is not exclusively available at Walmart.

Investigators last week were working to trace the point of sale of the suspect’s backpack, which was sold at Walmart.

Meanwhile, the FBI is focused on the unknown male DNA from a glove found about 2 miles from Nancy Guthrie’s home.

The FBI said it received preliminary results on Saturday. The FBI said on Sunday it was "awaiting quality control and official confirmation" before putting unknown male profile into the Combined DNA Index System, the national database known as CODIS.

The glove with the DNA profile "appears to match the gloves of the subject in the surveillance video," the FBI said.

-ABC News’ Aaron Katersky

President Donald Trump said in an exclusive phone interview with the New York Post that Nancy Guthrie must be released safely, or the kidnappers could face the death penalty if she is found dead.

Trump said Nancy Guthrie's kidnappers will face "very, very severe -- the most severe" consequences when caught.

According to the Post, the reporter pressed Trump about whether that meant the Department of Justice would request the death penalty. Trump responded, "The most, yeah -- that’s true."

The interview came after Trump posted about the case on social media, saying that he hopes "there will be a positive result."

White House press secretary Karoline Leavitt said during a briefing last week that the administration wants the kidnappers to be "held to the fullest extent of the law possible."

-ABC News’ Michelle Stoddart

"Today" show host Savannah Guthrie shared a video on social media on Sunday, as the search continues for her 84-year-old mother, Nancy Guthrie, who was taken from her Arizona home on Feb. 1.

Speaking directly to "whoever has her or knows where she is," Savannah Guthrie said, “It’s never too late and you’re not lost or alone, and it is never too late to do the right thing and we are here.”

"We still have hope and we still believe," Savannah Guthrie said.

Investigators lifted DNA of an unknown male profile from a glove found along roadside brush about two miles from Nancy Guthrie's home, sources briefed on the investigation told ABC News.

The development was also confirmed by the FBI.

The glove appears to generically match the kind of gloves worn by the suspect who was recorded on the missing 84-year-old Guthrie’s doorbell camera, sources said.

Pima County Sheriff Chris Nanos told ABC News on Friday that DNA had been retrieved from multiple gloves.

"We’ve gotten DNA back," Nanos said. "So that's of use. Now [we] have to go through and try to eliminate people or make people."

The sheriff’s department sent the gloves to a private lab for analysis in Florida on Thursday evening and they arrived at the laboratory on Friday, according to the FBI.

The FBI received preliminary results from the laboratory on Saturday and was awaiting quality control and official confirmation on Sunday before putting the unknown male profile into a national database unique to the bureau, known as the Combined DNA Index System (CODIS), the FBI said. This process typically takes 24 hours from when the bureau receives DNA, according to the FBI.

Investigators collected approximately 16 gloves in various areas near Nancy Guthrie's house, sources told ABC News. Most of the gloves were searchers' gloves that were discarded in various areas when they combed the area, according to the FBI.

The one glove with the DNA profile recovered is different from other gloves found in the area and appears to match the gloves of the subject in the surveillance video, the FBI said.

-ABC News' Aaron Katersky and Luke Barr.