While the White House has yet to signal whether attorneys for the president will be present during the panel's proceedings, the president himself will be outside of London attending a North Atlantic Treaty Organisation summit as Wednesday's Judiciary Committee unfolds in Washington.
Collins made the announcement when Fox News host Chris Wallace asked him who Republicans would subpoena once the Intelligence committee completes its report on its investigation into President Donald Trump this week.
Intelligence Committee Chairman Adam Schiff had indicated in a letter to colleagues earlier this week that a report would be coming "soon" from his committee but had not provided a specific timeframe.
President Trump this week faces a dilemma central to the impeachment inquiry against him.
Political analysts say the ultimate verdict will come in next year's U.S. elections for president and Congress, and candidates from both parties have used the impeachment issue to ramp up their campaigns.
The Democratic-led House of Representatives Judiciary Committee, tasked with considering charges known as articles of impeachment, has given the president until 6 p.m. EST (2300 GMT) on Sunday to say whether he or his legal counsel will participate in an impeachment hearing on Wednesday.
If the documents are accepted, the Committee - chaired by Democrat Adam Schiff - will pass it on to the House Judiciary Committee, which is chaired by Democrat Jerry Nadler and who will oversee the next phase of hearings. We all would like to hear from Mick Mulvaney.
Trump has denied any wrongdoing and called the impeachment inquiry a witch hunt aimed at unseating a democratically elected president. Trump's backers, without offering any evidence, have accused the former vice president of pushing for the firing of an ex-Ukrainian prosecutor to protect his son.
It also will allege "an unprecedented campaign of obstruction in an effort to prevent the committees from obtaining evidence and testimony", Nadler wrote.
Lawmakers on the committee spent the weekend sparring over the makeup of that panel of constitutional experts, with the committee's top Republican, Rep. Doug Collins (R-Ga.), requesting that it include an equal number of witnesses favorable to the Democratic and Republican perspective. He said Schiff himself should be called to testify before the panel. Democratic House Speaker Nancy Pelosi, who will make the final decision, has not said yet whether the Republican president should be formally impeached.
In the now-famous July 25 call with Zelensky - in which a White House-released call record has the USA leader asking his Ukrainian counterpart to "do us a favor, though" - McClintock said Trump was merely talking like the brash Manhattan real estate developer he once was, rather than using the "delicate language of diplomacy". The San Francisco Democrat has repeatedly noted that no one is above the law, but she also urged fellow lawmakers to bear in mind the extreme gravity of impeaching a president.
The House Judiciary Committee could vote on whether to recommend articles of impeachment within the next two weeks, setting the stage of a possible impeachment vote by the full House before Christmas, according to Democratic aides.