BOSTON -- U.S. Rep. Joe Kennedy, D-Mass., urged Congress and President Donald Trump to go slowly on tax reform and work in a bipartisan fashion.

"I'd urge the president to go slowly, go methodically, engage finally across the aisle," Kennedy said, speaking to reporters before an unrelated event in Boston.

Trump on Wednesday is planning to begin his push for tax reform.

The president has laid out some general principles of his tax reform plan, including reducing the number of individual tax brackets while increasing the standard deduction, repealing the alternative minimum tax and estate tax, and lowering the corporate tax rate. But he has not yet offered many specifics.

Kennedy said Congress will need a plan that is more in-depth than Trump's.

"When you're talking about taxes, this is arguably the hardest thing Congress has to do," Kennedy said. "It affects the incentives of our entire economy."

Kennedy said Congress will have to take Trump's goals, then begin the process of holding committee hearings.

Republicans, he said, should not use a process called reconciliation - which means a bill would need only a simple majority to pass and would not necessarily need any Democratic support. Democrats used reconciliation to push through the Affordable Care Act under former President Barack Obama.

"Historically, when you do something really big through reconciliation, it means whatever partisan power overplays their hand and the pendulum goes the other way," Kennedy said. "If you're talking about tax reform, which the country needs ... let's try to get those principles set up then work through the process deliberately to make sure there is a consensus that can be formed."