His plan would pay for the additional spending using unspent stimulus funding, along with cuts in other areas.

“There are some programs in that legislation that are important to Massachusetts during this economic crisis,’’ Brown, a Republican, says in a video message he is planning to release this morning. “But we need to find a way to pay for them.’’

Brown has come under increasing pressure from Massachusetts advocates, unions, and unemployed residents for continuing to block efforts by Senate Democrats to extend unemployment benefits. Senate Democrats have failed to pass the measure three times, scaling it back each time, but Brown has joined Republican filibusters to block it.

“It’s disgraceful that Senator Brown is using his political leverage to protect financial elites while turning his back on Massachusetts’ unemployed residents,’’ Rich Rogers, executive secretary-treasurer of the Greater Boston Labor Council, said yesterday. “He should turn his pickup truck in for a limousine.’’

Harry Reid, Senate majority leader, filed a new plan last night that will come to the floor later this week. The plan would extend unemployment benefits and give home buyers an extra three months to complete purchases and still take advantage of tax credits of up to $8,000.

His plan does not include a boost in Medicaid funding for states, which budget writers in Massachusetts have been expecting. Brown’s plan includes a Medicaid boost, but it was unclear last night how much.

— Matt Viser