Sen. Cory Gardner declined to say whether Congress should take actions to protect the probe, while Sen. Michael Bennet directly criticized President Donald Trump.
Prominent members of the Trump administration headlined, including Attorney General Jeff Sessions and E.P.A. Administrator Scott Pruitt of the EPA.
"I don't think that's appropriate for me to, in effect, violate or neuter federal marijuana law," Sessions said Friday.
The theme of this year's summit is "Fortifying Freedom," appropriate for a time where many conservatives feel their freedoms are under attack.
After four months of whiplash for the cannabis business community, Sen. Gardner's support of the industry has empowered investors again.
The federal government cannot withhold public safety grants from cities that refuse to cooperate with President Donald Trump’s immigration enforcement policies, a federal appeals court ruled Thursd
While Congressman Lamborn is no fan of marijuana, he now says he supports studying the potential medicinal qualities of it.
The holds have created friction both with Sessions and some of Gardner’s fellow GOP senators who want key law enforcement officials in their states confirmed.
I refuse to meet with the President under these kinds of threats and fear mongering," Denver Mayor Michael Hancock said.
With a one page memo AG Sessions removed certain protections for people doing business in legal recreational marijuana.