This is completely normal:
The Army has placed Alexander Vindman, an expert on Ukraine and a central figure in the impeachment inquiry into President Donald Trump, and his family under 24-hour security monitoring after Trump targeted Vindman in tweets accusing Vindman of being politically opposed to Trump.
Vindman was one of the people who listened in on Trump’s calls with the Ukrainian president, in which Trump asked for a favor, now understood to be a request that Ukraine investigate Joe Biden and his son for corruption. Vindman expressed his concern over the call with National Security Counsel lawyers, and spoke to the House Intelligence Committee about the call in a closed-door hearing several weeks ago.
U.S. officials told The Wall Street Journal that the Army has in recent weeks conducted a security assessment of Vindman and his family’s home and internet presence, and said they are prepared to move the Vindman’s to a military base if there are any threats to their safety.
This is why his family fled the Ukraine, and now Putin’s bitch has done it here.