Donald Trump’s meeting with a Holocaust-denying extremist is finally drawing significant GOP criticism and casting doubt on his political viability following the tepid launch of his 2024 campaign.

Some Republicans, albeit tentatively and often with self-protecting caveats, are beginning to test whether the political incentives for criticizing the ex-president could outweigh the hazards. This trend is obvious in reactions from ex-Vice President Mike Pence and some top lawmakers over Trump’s dinner at his Florida resort last week with White supremacist Nick Fuentes. It was also visible earlier this month in critiques of the ex-president after many of his election-denying, neophyte candidates flamed out in the midterm elections and suggested that he could again doom Republicans in a general election in 2024. ...