The impeachment inquiry into President Trump continues.

Here are some news developments to keep you up to speed.

Monday, Charles Cupperman, who was the deputy national security adviser to John Bolton,

did not show up to testify on Capitol Hill.

He did this despite a congressional subpoena and a warning from Democrats

that a failure to appear could result in a contempt citation.

Last week, Cupperman filed a lawsuit asking a federal judge to resolve conflicting orders from Congress and the White House.

The White House had instructed him not to appear.

The case could become a major test of a constitutional dispute between the Trump administration and Congress.

Tuesday, House investigators heard testimony for the first time from a White House official who listened in on the controversial Trump call at the heart of the Ukraine controversy.

Lieutenant Colonel Alexander Vindman, a top Ukraine expert on the National Security Council,

testified that he was so concerned by the call that he reported it to the NSC's lead council.

Vindman also said that the president's request could be seen as a quote partisan play that could undermine U.S. national security.

Plus, on Wednesday, two career diplomats arrived at the House to testify before impeachment investigators.

That testimony is expected to detail U.S. officials' efforts to support Ukraine only to be batted down by the White House.

Meanwhile, as officials testified, lawmakers on the Hill reacted to news that House Speaker Nancy Pelosi announced plans for a vote.

No, not a vote on the articles of impeachment, but Pelosi did announce Monday that the House will plan a vote on a resolution formalizing the impeachment probes rules and procedures for its next phase.

For weeks, Trump and Republicans have claimed the inquiry is illegitimate and criticized the process.

But now that there's plans for a vote, Republicans claim vindication, arguing that the planned vote underscores the idea that the process thus far has been flawed.

Tuesday afternoon, Democrats released the resolution, or the set of procedures and rules that the House members would be asked to vote on.

Among the rules that they're proposing, House Intelligence Committee Chairman Adam Schiff could authorize longer periods to question public witnesses.

And minority members or Republicans could make their own requests for documents and testimony subject to the committee's approval.

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