Sen. Jeff Flake (R-Ariz.) said Sunday that he thinks Arizona is "certainly" winnable for the Democratic presidential nominee in 2020.

Flake, appearing on CNN's "State of the Union," said that voters in the traditionally red state are "rejecting" candidates that are tied too closely to President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE.

"I think we’ll see the same trends as we’ve seen elsewhere. … You cannot run as someone who is just tied at the hip with the president and win statewide," he said.

"Voters in Arizona are rejecting that. I think we’re seeing that elsewhere in the country as well. We’re losing the suburbs," he added.

.@jaketapper: “Do you think Arizona is winnable for a Democratic presidential candidate in 2020?"



GOP Sen. @JeffFlake: “Oh it certainly is … You cannot run someone tied to the hip with the President and win statewide.” #CNNSOTU pic.twitter.com/5oiZDHmAdU — State of the Union (@CNNSotu) November 18, 2018

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His comments came after Democratic Rep. Kyrsten Sinema (Ariz.) pulled off a victory in Arizona's Senate contest, defeating Rep. Martha McSally (R-Ariz.) in a race that was called last week. Before Sinema's victory, Democrats had not won a Senate seat in the state since 1988.

McSally closely aligned herself with Trump during her campaign and received the president's endorsement. Trump won Arizona by less than 5 points in 2016.

Flake added Sunday that he's "very concerned" about the prospects for Republicans in Arizona moving forward.

"I’m very concerned about where we are in Arizona and elsewhere in the country," he said.