LEESBURG, Va. — Gina Anders knows the feeling well by now. President Trump says or does something that triggers a spasm of outrage. She doesn’t necessarily agree with how he handled the situation. She gets why people are upset.

But Ms. Anders, 46, a Republican from suburban Loudoun County, Va., with a law degree, a business career, and not a stitch of “Make America Great Again” gear in her wardrobe, is moved to defend him anyway.

“All nuance and all complexity — and these are complex issues — are completely lost,” she said, describing “overblown” reactions from the president’s critics, some of whom equated the Trump administration’s policy of separating migrant children and parents to history’s greatest atrocities.

“It makes me angry at them, which causes me to want to defend him to them more,” Ms. Anders said.

In interviews across the country over the last few days, dozens of Trump voters, as well as pollsters and strategists, described something like a bonding experience with the president that happens each time Republicans have to answer a now-familiar question: “How can you possibly still support this man?” Their resilience suggests a level of unity among Republicans that could help mitigate Mr. Trump’s low overall approval ratings and aid his party’s chances of keeping control of the House of Representatives in November.