Heinrich was elected in November and sworn in as a U.S. Senator last week.
Heinrich replaces Jeff Bingaman, another strong proponent of filibuster reform.
Heirnich spokeswoman Whitney Potter said in an email to New Mexico Telegram, “Martin supports Senator Tom Udall’s efforts to reform the filibuster through the constitutional option and looks forward to working alongside him to ensure that the Senate rules do not result in gridlock or prevent vital legislation from moving forward.”
Udall and two other Senators introduced filibuster reform changes last week.
Udall and others say this is needed to break the unprecedented gridlock that has plagued the Senate in recent years.
The decision by the full Senate will come later this month.