The U.S. Senate began a heated debate Monday on its version of healthcare reform.

Democrats are deeply divided over what should and should not be in the bill.

Senate Majority Leader Harry Reid, D-Nev., eventually will need 60 votes to move forward with his nearly $1 trillion bill.

However, moderate Democrats are threatening to bail over abortion funding and the public health insurance option.

Republicans also oppose the bill saying the reforms would raise premiums and add to the deficit.

Reid warned the senators he plans to make them work every weekend until the bill is passed.

"Let's discuss the specifics of this bill, not the whispers and wild rumors," Reid said. "We will disagree at times. Let us at least agree that doing nothing is not an option."

"The majority is intent on passing this bill that the American people oppose, we know that from all of the surveys," Sen. Minority Leader Mitch McConnell, R-Ky., said.

"Mr. President there are many things we must do this month," he continued. "And yet we're going to spend an enormous amount of time on a bill the American people wish we would not pass."

The debate is expected to last at least until Christmas.