GOP strategists around the country are concerned that President Trump’s vocal opposition to mail-in voting is resonating with Republicans, imperiling years-long efforts by the party to sign people up to vote by mail…

“Whether we like it or not, increased vote-by-mail is going to be a reality this fall,” said Phil Cox, a former head of the Republican Governors Association. “Successful campaigns will need an integrated mail-in ballot strategy that blends messaging, modeling, and targeting. Anything short of that will be conceding votes.”…

A Pew Research Center poll conducted last month found 83 percent of Democrats said voters should be allowed to vote early or by absentee without an excuse — compared to just 44 percent of Republican voters who said the same…

“It’s a huge issue,” said one Republican strategist who asked not to be named. “Republicans I talk to are worried. They’re seeing the effects of it already.”