Here's an evolving count of which senators are voting for Trump's Supreme Court pick

Wikipedia; Chip Somodevilla/Getty; Skye Gould/Business Insider

• President Donald Trump nominated Brett Kavanaugh to serve on the Supreme Court.
• The Senate, tasked with the confirmation process, is split at 51 Republicans and 49 Democrats.
• Republicans will need a minimum of 50 votes, so that Vice President Mike Pence can cast a tie-breaker.
• But each party is looking to lock down all of their members as quickly as possible.

When President Donald Trump nominated Brett Kavanaugh, a federal appeals judge, to fill the vacancy on the Supreme Court left by retiring Justice Anthony Kennedy, it immediately created a horse race for Republicans to lock down at least 50 votes in his favor. Meanwhile, Senate Democrats are looking to block the nominee.

Because of the split nature of the Senate, in which Republicans control 51 seats and Democrats have 49 (including two independents who caucus with Democrats), the confirmation process will come down to the wire. Republicans need a minimum of 50 votes, creating a scenario in which Vice President Mike Pence could cast the deciding vote as the tie-breaker.

Most senators are reliable to tow the party line as to how they vote for Kavanaugh. But the vote count will likely be closer than ever, because of a mix of two moderate Republican in Sens. Lisa Murkowski of Alaska and Susan Collins of Maine, along with a handful of Democrats facing tough reelection bids this November in traditionally red states.

This graphic serves as an ongoing whip count of who is leaning which way and whose final vote is still up in the air. It will be updated accordingly.