Senate President Thomas Rivera Schatz says Ricardo Rossello does not respect the will of the people by choosing an 'accomplice' to succeed him.
Reform panel sets out nine proposals including revival of Parliamentary Service Act.
The motion is adopted by 34 votes in support out of 57 who took part in the debate.
The prime minister tells senator the project is also about creating an ecosystem in which entrepreneurs and industries can thrive and provide jobs to youths.
The controversial senator has been criticised for comments that came just hours after the massacre, including calling Islam “the religious equivalent of fascism.”
They say the upper house generally requires professionals with both expertise and experience.
The procedural vote is a strong sign that William Barr will win confirmation in the Republican-controlled chamber.
Barr, a longtime Republican ally, will go before the Senate Judiciary Committee in confirmation hearings on Tuesday and Wednesday.
Democrats have been jockeying to lead overlapping investigations into the president.
Secretary of State Mike Pompeo says there is a "real risk to the United States of America" from Iran, which is allied with Huthi rebels who control Yemen's capital Sanaa.
Republican Senator Cindy Hyde-Smith has won Mississippi's US Senate runoff election against Democrat Mike Espy.
Republican Governor Rick Scott urged every sheriff in the state to watch for any violations during the recount process as outlined in Florida law, and to take appropriate actions.
Senate Democrats were pondering suing Trump, the sources said, on the grounds that, in naming Whitaker, the president ignored a statutory line of succession at the Justice Department.
Florida's Governor Rick Scott, the Republican challenging incumbent Senate Democrat Bill Nelson, filed a lawsuit against two election officials alleging fraud after his lead narrowed.
The two southern states are in the spotlight after Tuesday's closely watched midterm elections, in which Democrats reclaimed the House of Representatives from President Donald Trump's Republicans and flipped a number of governorships.
Democrats said Republican lawmakers will no longer be able to protect Trump from a watchful Congress.
Republicans held their majority in the Senate but the Democrats were on course to regain control of the House, which could impact Donald Trump's legislative agenda.
Romney, who is Mormon, ran a successful campaign in a majority-Mormon western state that has had mixed feelings about the brash and combative president.
At stake are all 435 seats in the House of Representatives, 35 seats in the 100-member Senate, 36 governor's posts and seats in state legislatures across the country.
From the danger of Democratic Senate candidates losing their seats in Missouri to duelling female candidates in Arizona, the US midterms elections will see a number of interesting contests.
It is a scenario that could focus international attention on the Southern state and bring in millions of dollars from outside political groups.
Democrats, while still favoured overall, have been unable to build a decisive edge over Donald Trump's Republicans.
Australia's treatment of its indigenous population has long been a festering historical and political sore.
The Senate voted 50-48 to approve Kavanaugh as more than 1,000 protesters rallied in Washington against a nominee who has been plagued by allegations of sexual misconduct.