Washington (CNN) -- A Senate committee will expand its probe into the U.S. Secret Service this week following a scandal involving prostitutes in Colombia in advance of a recent trip by the president. 

The Homeland Security Committee will send the Secret Service "some questions this week, as the beginning of our broader investigation, asking whether... this was an exception, or is there anything in the records that show this is a pattern of misconduct that has gone on elsewhere by Secret Service agents on assignment, but off-duty?" Sen. Joe Lieberman, the committee chairman, told "Fox News Sunday." 

"Why wasn't it noticed if that was the case? What's the Secret Service going to do to make sure it never happens again?" 

Some Secret Service members and agents allegedly brought back several prostitutes to a hotel in Cartagena, according to sources familiar with the U.S. government's investigation. 

The Secret Service says 12 members of the agency have been implicated in the incident. 

Across the Sunday political talk shows, officials expressed confidence in Secret Service Director Mark Sullivan, saying they believe he has handled the scandal well and will get answers. 

"History is full of cases where enemies have compromised" people with security or intelligence information through sex, said Lieberman, I-Connecticut. He added that based on what he has been told so far, "there is no evidence that information was compromised" in this case. 

Down the road, the committee will hold a public hearing on the matter -- perhaps more than one, Lieberman said. 
Will there be another meeting?
How many meetings will there be?
Says who?
Where is he from?
What is he head of?
Which one?
Who is being investigated?
How many agents?
Who were they with?
Who was involved in the scandal?
Where were they staying?
Which city?
Has anyone ever been compromised through sexual acts?
Where were the hookers taken?
Will a private meeting be scheduled?
Who was Lieberman talking to?
Who is the head of the Secret Service?
And his title?
Is he believed to have handled the situation properly?
Which party is Lieberman?
will expand
will expand
more than one
 more than one
Lieberman
Lieberman
Connecticut
Connecticut
committee chairman
 committee chairman
The Homeland Security Committee
The Homeland Security Committee
Secret Service
Secret Service
12
12
the president
the president
prostitutes
 prostitutes
Colombia
Colombia
Cartagena
Cartagena
yes
enemies have compromised
to a hotel
to a hotel
no a public hearing
 public hearing
Fox News
Fox News
Mark Sullivan
Mark Sullivan
Director
 Director
yes, he believed so
he has handled the scandal well
Independent
I