I honestly doubt the current U.S. administration would do anything if say, Denmark started internal inquiries about whether their politicians' decision to participate invade Iraq was made on false grounds. If they did, the EU would probably not be happy about trade sanctions.

Denmark was obviously just an example, but there are a lot of U.S. allies, trading partners and so on, that all have assisted or participated in the war on terror.

Besides, the Democrats could probably just blame it on Bush anyway.