To impeach the President, he must be accused of “ HIGH CRIMES ‘ and/or misdemeanors .

That being the case, an impeachment must be a criminal proceeding . Would not the 6th Amendment apply and if so should not the lawyers for the accused, Pres. Trump, have the right to confront the “ whistle blower “ . He/She should not be allowed to remain unknown.

The sixth amendment, as part of the Bill of Rights, guarantees certain rights in all criminal prosecutions. One of the enumerated rights in the 6th Amendment is the right to be confronted with the witnesses against the accused. This right is known as the Confrontation Clause. The confrontation clause guarantees criminal defendants the opportunity to face the prosecution's witnesses in the case against them and dispute the witnesses' testimony. This guarantee applies to both statements made in court and statements made outside of court that are offered as evidence during trial.
The Bill of Rights provided guarantees as to criminal prosecutions abuses from the federal government. The state governments did not have to abide by the restrictions of the 6th amendment. That changed when the 14th Amendment was passed which subsequently made the 6th Amendment's right to confrontation applicable to state courts as well as federal courts.