"Mr. Ambassador, I respectfully ask that your country lend any and all aid available to efforts underway to locate Mr. Beare and bring him back to his family safely," Coffman wrote in the letter, which was also sent to Secretary of State Rex Tillerson. "I would be extremely grateful for any assistance your government can provide."
Beare's family told Denver7 earlier this week they don't believe the Russian government is helping enough to locate their loved one. They have gone so far as to hire two helicopter crews along with a private search crew, which they explained has not been inexpensive.
They have started a Facebook page where they are sharing updates on the search efforts.
On Thursday, they wrote that search efforts were again put on hold because of bad weather after an attempt at a morning search.
“Please continue to pray that this damn weather will improve,” they wrote.
A Russian police officer taking part in the search told ABC News Thursday that the initial search was delayed because no one had any idea where to begin searching. He added that the search would continue Friday, likely on the southern slope of the mountain, which is located in southern Russia.