Physical presence in the courtroom is sufficient to give a criminal court jurisdiction over a deft.
Habeas grounds not raised at trial or on direct appeal and then raised for the first time on a collateral challenge are subject to de novo review on matters of law if the government doesn't argue the procedural default at the District Court.
If the conduct relative to the statute's focus, the object of the statute's solicitude, occurred in the US, it is a permissible domestic application of the statute, even if related conduct occurred abroad. Since the protected victim was in the US while being coerced into the activity by means of the Internet, the present case is a permissible domestic application of the statute, even though the deft was abroad.