Mohib made the remarks in Washington on Thursday, underlining that Khalilzad was after legitimizing the Taliban and decreasing the legitimacy of the Afghan government during the discussions.
Saying that the US envoy has personal ambitions to lead his native Afghanistan himself, Mohib asserted that Khalilzad's moves were motivated not by the goal of peace, but rather personal political gain.
"Knowing Ambassador Khalilzad's own history, personal history, he has ambitions in Afghanistan. He has wanted to run for president twice, in 2009 and 2014," Mohib said, suggesting the US envoy was deliberately undercutting the Ghani government to create a crisis, and then install a colonial-style government that he would oversee.
But "this is not the Afghanistan that he was born in," Mohib said, suggesting Khalilzad may be overcome with "nostalgia" for not having done a better job during the Bush years. He said there had been frequent meetings between Khalilzad and former Afghan President Hamid Karzai, who remains an influential force in the country's politics.
He called that the "wrong approach" and said they were not being kept in the loop on the process.
"We get bits and pieces of information," Mohib said, adding, "We don't have the kind of transparency that we should have. There isn't proper access to information. The last people to find out are us."
"Knowing Ambassador Khalilzad's own history, personal history, he has ambitions in Afghanistan," Mohib said, adding that Khalilzad had presidential aspirations in 2009 and 2014.
"The perception in Afghanistan and the people in the government think, perhaps, perhaps all this talk is to create a caretaker government of which he will then become the viceroy," he said. "We're only saying this because that's perception we have ... the reason he's delegitimizing the Afghan government and weakening it and at the same time elevating the Taliban can only have one approach. It's definitely not for peace."
Peace talks with the Taliban began last year, as US President Donald Trump announced a reduction in the number of US troops in Afghanistan and a pullout from Syria. Trump has spoken on multiple occasions of wanting to end the war that started in 2001 and turned into one of the longest conflicts in US history.
Following the 9/11 terrorist attacks in New York and Washington, the US blamed the Taliban for harboring their alleged mastermind, Al-Qaeda leader Osama Bin Laden. US troops invaded Afghanistan in late 2001 to overthrow the Taliban and hunt down Bin Laden. The Al-Qaeda leader was eventually located in neighboring Pakistan and killed in a May 2011 raid. However, the war against the Taliban continued, even as the Washington-backed government in Kabul continued to lose territory and troops.