WASHINGTON—Top White House officials said Sunday they didn’t have enough information to judge whether Republican Senate candidate Roy Moore should withdraw from his race over allegations that he pursued teenage girls, including one 14-year-old, while he was in his 30s.

Mr. Moore, who is running for a U.S. Senate seat from Alabama, has denied sexual misconduct. The claims against him have split the GOP and thrown into question the balance of power in the Senate, where Republicans currently hold a narrow majority of 52.

...