The Senate Judiciary Committee on Thursday approved legislation to crack down on the illegal trafficking and straw purchasing of firearms.

The bill was approved in an 11-7 vote largely along party lines. Sen. Charles Grassley (Iowa), the senior Republican on the Judiciary Committee, was the only GOP lawmaker to vote yes.

With strong opposition to proposals that seek to ban the sale of assault weapons and high-capacity clips, and institute universal background checks, the illegal tracking bill likely has the best chance of any gun violence bill of passing Congress this session.

It is the first of four bills under consideration by Judiciary.

The panel also began marking up legislation from Sen. Dianne Feinstein (D-Calif.) that would ban certain semi-automatic weapons. It concluded work on several amendments before tabling the bill for further discussion to allow Feinstein and other senators to attend an unrelated meeting. It is unclear if work on the bill will resume Thursday.