Other lawmakers said they supported Pistole and praised his efforts in leading the agency.
CNN: TSA chief faces critics, says new knife policy will stand
"If we focus only on objects then we're always behind the eight ball, " Pistole said.
Mr. Pistole said that will change as the program expands and the agency collects more data.
Rep. Sheila Jackson Lee, D-Texas, said Pistole needed to change course on the rule change -- fast.
CNN: TSA chief faces critics, says new knife policy will stand
"I think the decision is solid and it stands and we plan to move forward, " Pistole said.
"There is no magic bullet for Oregon, " says Pistole, who himself moved from California just three years ago.
Sources indicate that Pistole briefed AFA President Veda Shook and Lee Moak, president of the Air Line Pilots Association.
FORBES: Airline Industry Discord Emerges Over TSA Knife Policy
Pistole, the real estate appraiser, says it may be time to think small.
Pistole talked about privacy protections being in place, such as the right to have your patdown happen in private.
"I wish (the new rule) could be as clean as possible, " Pistole said.
On the other hand, searching for the knives on passengers or in their carry-on bags is time consuming, Pistole said.
The TSA said this week that Pistole will stick with the policy and implement it, as announced, on April 25.
Pistole also said the FBI is evaluating whether there needs to be additional security assessment of chaplains once they start service.
But he said he questioned the process Pistole had used, arguing that he hadn't involved enough stakeholders from the airline industry.
CNN: TSA chief faces critics, says new knife policy will stand
Pistole said the move brings the United States into alignment with international rules and are keeping with his "risk-based security" approach.
The TSA has expanded its PreCheck program under Pistole, expediting travel for frequent fliers and others who provide information on themselves.
"We can reduce the size of the haystack when we are looking for that one-in-a-billion terrorist, " said TSA Administrator John Pistole.
Pistole acknowledged that the knives could be used to injure people on a plane, but he said that's not the TSA's responsibility.
Pistole said the TSA sought to distinguish small pocketknives, such as those equipped with corkscrews, from sturdier knives used primarily as weapons.
Pistole said travelers should do to the TSA website and read up.
Today, TSA chief John Pistole attended an oversight hearing on Capitol Hill.
Under the TSA's risk-based security, Pistole has sought to "reduce the haystack, " giving modified screening to travelers under age 12 and over age 75.
"If undetected, I believe there is a high likelihood the terrorists would have killed hundreds of people that day, " Pistole says on the TSA blog.
Transportation Security Administration chief John Pistole told ABC television that the system was "under review to make it meaningful and relevant to the American people".
Transportation Security Administration head John Pistole said the changes will take effect April 25 and will bring the United States into alignment with international rules.
"I think the decision is solid and it stands, " Pistole said.
CNN: TSA chief faces critics, says new knife policy will stand
Pistole stood firm as he faced questions and criticism from lawmakers.
CNN: TSA chief faces critics, says new knife policy will stand
"Pistole's decision is putting my guys at greater risk, " Adler said.
Pistole also testified that children under 12 are exempt from patdowns.
About a year ago, notes real estate appraiser Steve Pistole, prices were rising 2% a month, while those in Portland were "only" rising 8% a year.
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