The Republican Party's losses in several key states have significant implications for their prospects in future elections, particularly the 2028 presidential election.
US President Donald Trump has made numerous disputed statements and online attacks since returning to the White House, including false claims about immigration and foreign conflicts.
Federal filings and sources indicate that four traditionally Republican-held Senate seats have become competitive ahead of the midterm elections.
The final week of campaigning has begun, with control of Congress hanging precariously in the balance.
The search was criticized by former President Barack Obama, who accused the Trump administration of using federal power to intimidate a law-abiding official.
