Congressional Republicans could be nearing crucial tests of their loyalty toward President Donald Trump and of how well they’ve mastered the art of walking a political tightrope during his turbulent presidency. Should damning evidence accumulate that Trump pressured the Ukrainian president to investigate Joe Biden, a potential 2020 presidential rival, some Republicans facing reelection next year may be forced into a painful political box. With the most recent polls showing Trump is supported by 8 in 10 Republican voters or more, any GOP lawmaker who abandons him could well inspire a primary challenge that might be tough to survive.
