The Senate is diving into a contentious late-night — or all-night — debate on a budget plan critical to Republican efforts to pass trillions of dollars in tax cuts and boost border security and defens

The Montana Senate Taxation Committee voted down two major tax bills backed by Gov. Greg Gianforte Wednesday, killing a measure that would have cut a full percentage point off the state’s primary income tax rate and another that would have increased property taxes on second homes as part of efforts to lower homeowner tax bills.

After a marathon overnight session, the U.S. Senate advanced a key piece of legislation to unlock President Donald Trump's legislative agenda early Saturday morning. The resolution approved 51-48 will be the blueprint for a massive party-line bill that Republicans hope to pass without Democrats' help through a process known as "reconciliation.

The Senate vote is one big step in a long process. And the debate revealed intra-party tension over key issues like Medicaid, tax-cut strategy and the debt.