ANCHORAGE — Alaska Republicans have railed for years against ranked-choice voting. Now some worry it could cost them in a critical Senate race. GOP. Sullivan is facing not only well-known former Democratic Rep.

Early voting began in Alaska and Texas, two states that could determine whether Republicans retain a majority in Congress.

Trump is touting billions in pipeline investment and other benefits as Republicans try to keep Sen. Dan Sullivan’s seat, seen as key to maintaining Senate control.

A suspicious envelope sent to state election officials promoted a swift emergency response from Capital City Fire Rescue over the weekend. On Oct. 17, CCFR’s Hazardous Materials (hazmat) Team was activated in response to an envelope addressed to the Alaska Division of Elections that may have contained an unknown white powder.

ABC News’ Martha Raddatz speaks to voters in Alaska, where two-term Republican Sen. Dan Sullivan faces off against Democrat Mary Peltola.

Kansas, Ohio, Alaska, Iowa and Texas are in the crosshairs as Democrats hope to flip the two additional GOP-held seats they need along with well-known targets of Maine and North Carolina.

Veda Partners' Henrietta Treyz discusses how affordability, healthcare, higher costs associated with the Iran war, and President Trump's energy deal with Russia are playing with voters in Alaska, Kansas and Texas.

ABC News spoke with voters in Alaska, Iowa, New Hampshire and Maine.

Democrats eye multiple paths to flip the Senate majority as six toss-up races across Alaska, Iowa, Maine, Ohio and Texas shape Election Day.