WASHINGTON,
 March 1 (Reuters) - The White House on Friday said the U.S. government 
was taking seriously an internal watchdog report that the U.S. 
ambassador to Singapore threatened his staff and failed to submit about 
$48,000 in travel expenses on time or with proper documentation.
Ambassador
 Jonathan Kaplan, a political appointee, had poor relations with some 
Singaporean ministries and was often unprepared on issues, the State 
Department's Office of Inspector General (OIG) said in a report.
"OIG
 found the ambassador did not model integrity, plan strategically, 
collaborate, or communicate," it said, urging the State Department to 
assess his leadership and management and, if appropriate, "take 
corrective action."
"Numerous
 staff described a fear, and even direct threats, of reprisal from the 
Ambassador," it said. "They described his mannerisms with personnel as 
belittling and intimidating."
The
 report noted the ambassador's view that "although there had been a 
difficult transition when he assumed his position, morale had improved 
under his leadership, and he was confident that he had gained the trust"
 of his staff.
"The
 president always wants his representatives ... to manage people with 
dignity and respect," White House National Security Council spokesman 
John Kirby told reporters. "He's comfortable that the State Department 
is taking this seriously."
The
 report faulted Kaplan, an entrepreneur, for failing to follow 
procedures in hiring consultants who submitted bills of $5,650 for "a 
furniture research project" and of $4,250 to redesign the embassy's 
cafeteria.
The
 report found Kaplan did not follow many of the State Department's 
travel policies, failing to use a travel agency under contract with the 
U.S. government and to comply with a U.S. law requiring the use of U.S. 
carriers.
"OIG
 found approximately $48,000 worth of outstanding travel obligations 
extending back to December 2021 that either were not submitted for 
reimbursement or lacked sufficient supporting documentation to pay the 
travel claim," it said.
Reporting By Arshad Mohammed. Editing by Gerry Doyle