U.S. attorney general nominee William Barr says he would “not go after” marijuana companies in states like Colorado where cannabis is legal.

Barr noted at his confirmation hearing before the Senate Judiciary Committee that companies had relied on Obama-era guidance that kept federal authorities from cracking down on the pot trade in states where the drug is legal.

Former Attorney General Jeff Sessions, whom Barr has been nominated to succeed, rescinded that guidance, known as the Cole Memo, last year. Sessions’ action came days after California’s broad marijuana legalization.

Since the guidance was rescinded, there has been concern about the future of the growing cannabis industry.

Federal law still prohibits the possession and sale of marijuana.

Barr says he believes that the “current system is untenable.”

Also at his confirmation hearing, Barr said he would “not carry out” any order to fire special counsel Robert Mueller without cause.

Mueller’s team is examining potential ties between Russia and the 2016 Trump campaign. Barr says he wants Mueller to finish the investigation.

Barr also testified that immigration reform is “long overdue” and expressed support for President Donald Trump’s hardline policies, including funding a border wall.

Asked about the partial government shutdown, in its fourth week due to an impasse over funding for a border wall, Barr says he would like to see a deal reached where Congress recognized that it was “imperative to have border security.”

Barr also said he believed so-called sanctuary cities were hurting law enforcement’s ability to safeguard the public. His predecessor, Jeff Sessions, sued California over the policies.