Former Massachusetts Sen. Scott Brown, who recently sold his home in the Boston area, will officially move to New Hampshire Tuesday to take up residence and consider running for the U.S. Senate, a close associate confirmed.

Brown, a Republican, who is weighing whether to run for against Democratic Sen. Jeanne Shaheen, will move into his former vacation home in Rye, N.H.

Brown likely won't make a final decision on the run until after the new year, but he is laying the groundwork now to challenge Shaheen. He will headline a holiday event for the New Hampshire Republican Party on Thursday, where he's expected to give what has become his standard speech in New Hampshire, heavy on biography and attacking Obamacare.

Brown also waded Tuesday into the congressional debate over a budget deal struck by Senate Budget Committee Chairwoman Patty Murray, D-Wash., and House Budget Committee Chairman Paul Ryan, R-Wis., taking to Twitter to stake out his opposition to the agreement.

"Senate budget deal unfairly cuts benefits for veterans, all senators should stand up for our military by voting against this bill," Brown tweeted.

Shaheen has said she supports the deal. Like Brown, Sen. Kelly Ayotte, R-N.H., opposes it.

Brown is also taking steps to root himself more firmly in New Hampshire, which could help to deflect Democrats' charges that he's a "carpetbagger." Brown plans to become a full-fledged resident of the state and contacted the Rye, N.H., town clerk roughly one week ago to ask about registering to vote there.

"He told me he is planning to become a registered voter in Rye soon," said Elizabeth Yeaton, the clerk. She said Brown did not outline an exact timeframe for the move.

There's no length-of-residency requirement to vote in New Hampshire, so Brown will be able to register to vote at any time.

Brown also plans to replace the Massachusetts license plates on his pick-up truck with New Hampshire plates. The Democratic group American Bridge last week mocked Brown's Massachusetts plates.

Brown will continue working at a law firm in Boston, although the commute from his New Hampshire home will be only slightly longer than it was from his now-former home in Wrentham, Mass.