The Senate has overwhelmingly voted to take up the bipartisan immigration reform bill that would establish a path to citizenship for millions of undocumented immigrants while radically expanding border enforcement. The 84-to-15 vote will kick off what’s expected to be a month-long debate on the bill’s passage. At the White House, President Obama urged lawmakers to send him legislation by summer’s end.

President Obama: “The system’s still broken. And to truly deal with this issue, Congress needs to act. … They’ve got the support of a broad cross-section of leaders from every walk of life. So there’s no reason Congress can’t get this done by the end of the summer.”

Republican leaders followed the vote with a reminder their support for beginning debate doesn’t mean final endorsement of the bill’s passage. Republican co-sponsor Marco Rubio of Florida is now saying he won’t support the bill unless the already-strict border security provisions are expanded. Tuesday’s vote saw a historic moment from Democratic Senator Tim Kaine of Virginia. Kaine spoke in favor of the immigration bill with a 15-minute speech entirely in Spanish, the first ever on the Senate floor.