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Congress is about to pass a major $1.4 trillion budget that President Trump will likely sign into law later this week.

It caps a remarkable frenzy of legislative activity among Democrats and Republicans still wrestling over President Trump's impeachment.

But sandwiched into the 2,371-page spending package are four massive policy changes that reflect both Republican and Democratic priorities.

Taxes funding Obamacare are to be scrapped; the smoking age will be raised; exporters will regain access to government-backed loans and the federal government will once again fund gun violence research after two decades.

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Congress is steadily advancing sweeping government spending bills toward President Trump's desk that he is expected to sign into law later this week.

The $1.4 trillion budget - divided into two pieces of legislation consisting of four and eight appropriations bills, respectively - caps a remarkable spasm of legislative activity among Democrats and Republicans over the last two weeks.

With the House preparing a divisive impeachment vote against Trump, both parties are eager to demonstrate their ability to govern and also steer federal dollars toward their constituents.

Passing the legislation would enable the government to keep its doors open for another year and provide stability for a web of federal agencies critical for essential services.

Last year, a brutal spending fight led to a 35-day government shutdown, the longest in American history. But partisanship has temporarily given way to a burst of dealmaking and horse-trading in a bid to avert that.

Here are four massive policy changes tucked into the 2,371-page spending package that reflect both Republican and Democratic priorities.