Of the more than 9 million voters who requested mail ballots through Monday in Florida, Pennsylvania, North Carolina, Maine and Iowa, the five battleground states where such data is publicly available, 52 percent were Democrats. Twenty-eight percent were Republicans, and 20 percent were unaffiliated.

Additional internal Democratic and Republican Party data obtained by The Washington Post shows a similar trend in Ohio, Minnesota, New Hampshire and Wisconsin.

Even more alarming to some Republicans, Democrats are also returning their ballots at higher rates than GOP voters in two of those states where that information is available: Florida and North Carolina.

The wide Democratic lead in mail voting so far has been the subject of urgent discussions among top GOP officials, according to people familiar with the conversations.

The margins are “stunning” — and bad news for Republicans up and down the ballot, said longtime GOP pollster Whit Ayres. While the Republican Party is focused on getting voters out on Election Day, he noted that older voters who have traditionally supported Republicans are most concerned about being infected with the novel coronavirus and could choose to stay home if the outbreak intensifies as the election nears.