City and state leaders joined forces over the weekend to stand up against the GOP's tax bill, ahead of this week's House vote on the plan.

Mayor Bill de Blasio rallied at City Hall Sunday alongside most of the city's congressional delegation. 

They want lawmakers to reject the plan which they say lowers home values and drains local resources.

"Seven hundred thousand plus New Yorkers would experience double taxation. They'd lose their state and local tax deductability, they'd be hit with higher taxes than ever. That's why you even see a number of the Republican House members standing up and saying this is not fair," De Blasio said.

"It is a choice in favor of millionaires, billionaires, CEOs, and the most wealthy Americans, and it will harm every one of us," said Senator Kirsten Gillibrand.

House Republicans are saying the opposite, that it helps the middle class.

The proposal calls for a repeal of the estate tax paid by the wealthiest Americans. 

The plan would also trim the current number of tax brackets from seven to four. 

Meantime, Senate Republicans have released their own tax plan.

That one would keep the seven tax brackets, and only partially repeal the estate tax.