As U.S. gears up for an important vote on whether to debate a gun control law, Vice President Joe Biden called threats to block votes "mind boggling".
The U.S. senate is set to hold an important vote on gun controls on Thursday.
But the vote's not about passing a bill...it's simply to decide whether it should even be allowed to the Senate floor for debate.
President Barack Obama has been campaigning to reduce gun violence since 20 children and six adults were killed in a massacre at a school in Connecticut in December.
But gun control is an emotionally charged issue, and 13 Republican senators say they'll use a stalling tactic known as a filibuster to block attempts to bring the bill up for debate.
It's unclear if the majority democrats will even get the 60 votes needed.
The legislation to be considered ranges from a proposed ban on military style assault weapons to universal background checks.
Opinion polls shows most Americans support more control measures but the firearms lobby, which exerts a powerful influence over lawmakers, believes a bill would infringe on the constitutional right to bear arms.