What Are the Requirements to Impeach a President?
So, according to this, it's all up to judiciary, not the speaker. Notice it says the chairman of the committee has to call for a resolution for a formal inquiry. This means it has to be voted on
Nope
From NPR
Must the House vote to conduct an impeachment inquiry?
Cipollone wrote: "the House of Representatives has never attempted to launch an impeachment inquiry against the President without a majority of the House taking political accountability for that decision by voting to authorize such a dramatic constitutional step."
The House has taken such a formal step in the past, including most recently with the impeachment of then-President Bill Clinton.
Pelosi has not called for such a vote but
announced last month that the House is conducting "an official impeachment inquiry."
POLITICS
Why Ukraine Is At The Center Of The Impeachment Inquiry
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However, a former senior House Republican aide told NPR that "there is a difference between what the House
should do and what the House
has to do."
The former aide, an expert on House rules who asked not to be identified because he is criticizing his own party, argued that it's best practice to have a vote of the full House.
But there is nothing in the Constitution or in the rules of the House that compel a full House vote to authorize an impeachment inquiry. Pelosi is breaking with precedent but not rules or the law.