Sen. Kyrsten Sinema (I-AZ) has been a hawk on the border in the Senate, but the decision about what to do with impeachment articles against Homeland Security Secretary Alejandro Mayorkas could serve as a test on the matter.

Democrats in the Senate are floating the idea of tabling the articles levied against Mayorkas by the GOP-led House of Representatives, but it would require all 51 senators who caucus with Democrats, including Sinema, to vote in the affirmative. Sen. Joe Manchin (D-WV), another centrist in the caucus, has openly expressed his opposition to the impeachment trial.