The United States Senate on Friday voted down a motion to consider witnesses and documents in President Trump’s impeachment trial.

The vote fell primarily along party lines. While all Senate Democrats voted in favor of the measure, they were joined by two Republicans. Senators Susan Collins and Mitt Romney defected from their party to vote for the motion.

The vote garnered substantial attention after news outlets reported former National Security Advisor John Bolton had relevant testimony for jurors to hear. It was revealed last week that Bolton’s new book details direct instructions from Trump to freeze Ukrainian aid for political purposes. Trump has denied the allegation.

Republican Senators argue that the whole impeachment process has been a partisan effort and divisive in nature. Senator Lisa Murkowski stated, “I don’t believe the continuation of this process will change anything. It is sad for me to admit that, as an institution, the Congress has failed.”

Senate Democrats have accused Republicans of putting their political interests ahead of the interests of justice. Senator Kamala Harris, a former Attorney General, asserted that “You can’t have a fair trial without witnesses.”

The Senate is expected to hold a final vote on Trump’s impeachment trial next week.