In the letter, Sen. Johnson wrote that he viewed the inquiry as a “continuation of a concerted, and possibly coordinated, effort to sabotage the Trump administration,” and he questioned the motives of government witnesses who have voiced concerns about Trump’s handling of Ukraine.

Johnson released his accounting of what happened a day after he disclosed on NBC’s “Meet the Press” that two House Republicans, Ohio’s Jim Jordan and California’s Devin Nunes, had asked him for it

Johnson asserted that government officials expressing concerns about Trump’s conduct are doing so because they “have never accepted President Trump as legitimate and resent his unorthodox style and his intrusion onto their ‘turf.’” Johnson accused these officials of trying to sabotage Trump and called out one of them, Lt. Col. Alexander Vindman, by name.  

“It’s entirely possible that Vindman fits this profile,” Johnson wrote of Vindman.

The senator’s involvement in Ukraine traces to his role as chair of the Europe subcommittee of the Senate Foreign Relations panel and membership in the Senate’s bipartisan Ukraine Caucus. 

Beyond that, Johnson has maintained an unusually high profile in the public debate over the Ukraine controversy that is fueling the impeachment effort, defending Trump in repeated media appearances and interviews and offering his own knowledge of key events. 

Johnson’s letter is at the end of the Journal Sentinel article.