Chicago (CNN)An Illinois teenager accused of trying to support ISIS pleaded not guilty Tuesday in federal court. 

Mohammed Hamzah Khan, 19, had invited his family to join him in his plans to travel to join ISIS in the Mideast, authorities said. The Islamic State in Iraq and Syria is using warfare and terror in an attempt to create an Islamic state across Sunni areas of Iraq and in Syria. 

The teenager's mother, Zarine Khan, condemned ISIS and accused it of using social media propaganda to brainwash Muslim youths. She cited last week's terror attacks in Paris that killed 17 people and allegedly involved a now dead suspect with ties to ISIS. 

"We condemn this violence in the strongest possible terms. We condemn the brutal tactics of ISIS and groups like them. And we condemn the brainwashing and the recruiting of children through the use of social media and Internet," the mother told reporters while reading tearfully from a statement. 

"We have a message for ISIS, Mr. Baghdadi and his fellow social media recruiters: Leave our children alone!" Zarine Khan said, as her husband, Shafi Ullah Khan, stood beside her. 

She was referring to Abu Bakr al-Baghdadi, the mysterious boss of the terror group ISIS. 

Her son is charged with one count of attempting to provide material support to a foreign terrorist organization. The charge he faces carries a maximum penalty of 15 years in prison and a $250,000 fine. 

He wrote that he was leaving the United States to join ISIS, according to a criminal complaint. Authorities said they found a three-page letter in the bedroom he shared with a sibling in Bolingbrook, Illinois, in which he invited his family to join him. But he warned them not to tell anyone about his travel plans, the complaint said. 
Who did Mohammed Hamzah Khan invite to join him on his trip?
his family