Republican Texas Rep. Michael McCaul sent a letter Wednesday morning to former White House press secretary Jen Psaki’s lawyer threatening a subpoena after she failed to respond to an original request to appear for a transcribed interview as part of the committee’s probe into the U.S. withdrawal from Afghanistan. The Daily Caller first obtained a copy of the letter, which was sent to Psaki’s lawyer, Emily Loeb. In it, McCaul, the chairman of the House Foreign Affairs Committee, mentions the fact that Psaki is a private citizen who recently published a book about her time in the Biden White House....