Top Pakistan officials said Obama's comment was irresponsible and likely made for political gain in the race for the Democratic nomination.
"It's a very irresponsible statement, that's all I can say," Pakistan's Foreign Minister Khusheed Kasuri told AP Television News. "As the election campaign in America is heating up we would not like American candidates to fight their elections and contest elections at our expense."
Also Friday, a senior Pakistani official condemned another presidential hopeful, Colorado Republican Tom Tancredo, for saying the best way he could think of to deter a nuclear terrorist attack on the U.S. would be to threaten to retaliate by bombing the holiest Islamic sites of Mecca and Medina.
that as president he would order military action against terrorists in Pakistan's tribal region bordering Afghanistan if intelligence warranted it. The comment provoked anger in Pakistan, a key ally of the United States in its war on terror.
Many analysts believe that top Taliban and al Qaeda leaders, including Osama bin Laden, are hiding in the region after escaping the U.S.-led invasion of Afghanistan in 2001.
President Gen. Pervez Musharraf has come under growing pressure from Washington to do more to tackle the alleged al Qaeda havens in Pakistan. The Bush administration has not ruled out military strikes, but still stresses the importance of cooperating with Pakistan.
"There are terrorists holed up in those mountains who murdered 3,000 Americans. They are plotting to strike again," Obama said. "If we have actionable intelligence about high-value terrorist targets and President Musharraf will not act, we will."
The Associated Press of Pakistan reported Friday that Musharraf was asked at a dinner at Prime Minister Shaukat Aziz's house on Thursday about the potential of U.S. military operations in Pakistan. Musharraf told guests that Pakistan was "fully capable" of tackling terrorists in the country and did not need foreign assistance.
Deputy Information Minister Tariq Azim said no foreign forces would be allowed to enter Pakistan, and called Obama irresponsible.
"I think those who make such statements are not aware of our contribution" in the fight on terrorism, he said.
Pakistan used to be a main backer of the Taliban, but it threw its support behind Washington following the Sept. 11, 2001 attacks.
Since then, Pakistan has deployed about 90,000 troops in its tribal regions, mostly in lawless North and South Waziristan, and has lost hundreds of troops in fighting with militants there.
But a controversial strategy to make peace with militants and use tribesmen to police Waziristan has fueled U.S. fears that al Qaeda has been given space to regroup.
In Pakistan's national assembly on Friday, Minister for Parliamentary Affairs Sher Afgan said he would bring on a debate next week on recent criticism of Pakistan from several quarters in the U.S., including Tancredo's remarks.
It was a matter of "grave concern that U.S. presidential candidates are using unethical and immoral tactics against Islam and Pakistan to win their election," Afghan said.
Tancredo told about 30 people at a town hall meeting in Osceola, Iowa, on Tuesday that he believes that a nuclear terrorist attack on the U.S. could be imminent and that the U.S. needs to hurry up and think of a way to stop it.
"If it is up to me, we are going to explain that an attack on this homeland of that nature would be followed by an attack on the holy sites in Mecca and Medina. Because that's the only thing I can think of that might deter somebody from doing what they otherwise might do," he said.