Hours before the vote to elect a new House speaker, a sign has appeared in front of the speaker's office with the message: "Follow Kevin McCarthy."

McCarthy was set to shore up more support for his speaker bid in a closed-door meeting with the Republican caucus this morning. He faces opposition from a group of hard-line conservatives, who could sink what is his second attempt to hold the gavel.

The California congressman's belongings have been brought into the speaker's suite, but if he doesn't get enough votes, he'll have to move out.

The House Republican conference will meet behind closed doors at 9:30 a.m., just hours before the speaker vote begins at noon.

While McCarthy might be able to garner more support in a last-ditch appeal, his detractors have boasted that they'll be able to muster the necessary opposition to block his bid.

Rep. Scott Perry, the chair of the House Freedom Caucus who is leading the group of hard-line conservatives opposing McCarthy's bid, released a new statement Tuesday morning blasting the California congressman.

"In his 14 years in Republican Leadership, McCarthy has repeatedly failed to demonstrate any desire to meaningfully change the status quo in Washington," Perry said.

Kevin McCarthy began his career as a staffer to then-Rep. Bill Thomas before chairing the California Young Republicans and later the Young Republican National Federation.

He was first elected to office in 2002, serving in the California state Assembly until 2007, when was elected to the U.S. House of Representatives. At the time, he was dubbed one of the “young guns” of the next generation of conservative leadership.

McCarthy tried to become speaker in 2015 but his chance evaporated after resistance from the same kind of conservatives who are trying to block his path Tuesday. When Democrats took control of the House in 2018, McCarthy was elected House minority leader.

Read more about McCarthy’s background here.

Rep. Kevin McCarthy's bid to become the next speaker of the House is still clouded in uncertainty as lawmakers head to Capitol Hill for the first day of the 118th Congress.

McCarthy and his staffers spent the day Monday setting up the speaker's office but he may have to move his belongings out if he fails to clinch the votes needed to secure the position.

A few dozen members piled into McCarthy's office throughout the day Monday to go over last-minute strategy. ABC News spotted three McCarthy critics during the afternoon meeting: Reps. Matt Gaetz, Lauren Boebert, and Scott Perry.

Rep. Marjorie Taylor Greene, a McCarthy supporter, told ABC News Congressional Correspondent Rachel Scott, "the problem is the people need to realize the art of the deal. They are all Trump supporters, and you can't be successful if you're not willing to take the wins when you get them" when asked about those in her party who are trying to tank McCarthy's bid.

Rep. Jim Jordan, whose name has been floated around as a potential speaker candidate, said he believes McCarthy "can get there."

McCarthy, however, didn't directly answer reporter's questions about how the vote could go, telling them, "I hope you all have a very nice New Year's" as he exited the Capitol on Monday night.

-ABC News' Lalee Ibssa, Rachel Scott and Gabe Ferris

Kevin McCarthy, just before swearing-in members, listed some of the priorities for the Republican majority in this 118th Congress.

The newly-elected House speaker said the very first bill Republicans will bring to the floor would repeal the billions of dollars in funding for additional Internal Revenue Service workers under the Inflation Reduction Act. Republicans assert the funding will result in the hiring of 87,000 agents to target middle-income families, which the Treasury Department has said isn't the case.

He then laid out what Republicans will be investigating, stating "one of our first hearings will be held at the Southern border."

He said to also expect committees to be formed to investigate how to win the economic competition with China, the withdrawal of American troops from Afghanistan and the origins of COVID-19.

"We will use the power of the purse and the power of the subpoena to get the job done," he said.

More details on the party's legislative agenda can be read here.