Sen. Wendy Davis of Fort Worth started the filibuster at 11:18 a.m. CT Tuesday. It will need to last till midnight — almost 13 hours of standing — to derail a vote in the Republican-dominated Texas Senate.
During the filibuster, Sen. Davis is required to stay on topic and is not allowed to lean on anything or take a break for the restroom.
In 2011, Davis filibustered to temporarily block cuts to public schools.
The senator tweeted on Monday that she planned to filibuster the bill.
House Democrats stalled almost all night Sunday, keeping the bill from reaching the Senate until 11 a.m. Monday.
The bill's sponsor, Republican state Rep. Jodie Laubenberg of Spring, incorrectly suggested that rape kits could be used to terminate pregnancies.
Watch the live stream of the filibuster:
UPDATE - June 25, 2013, 11:15 p.m. ET: The line for the Senate chamber to see Wendy Davis speak wrapped around the halls and went out the door.
Texas Lt. Gov. David Dewhurst, R-Houston, interrupts the filibuster with less than two hours to go.
In response, the crowd starts chanting "let her speak."
According to the Texas Senate's rules, the filibuster must stay on topic. Dewhurst ended the filibuster by calling third strike at 10:07 p.m., when Sen. Davis mentioned a 2011 sonogram law that Texas passed.
The first strike was for discussing Planned Parenthood's budget. Sen. Davis received her second strike because a colleague helped her adjust a back brace.