“”Mitch needs to declare Trump isn’t impeached until the senate receives the articles of impeachment.””
He’s not impeached, that calls for a 2/3 rds senate majority. The house voted to try him for impeachment. The house cannot impeach.
You need to read the constitution.
House has the sole power of impeachment.
Senate has the power to try it.
Hence the house is who impeaches. The senate is who removes.