Democratic US Representative John Yarmuth, who chairs the US House of Representatives Budget Committee, condemned the tweet of US Representative Thomas Massie of Kentucky.
Fifteen-year-old student opens fire at a high school in Michigan state, killing three students and leaving eight other people including a teacher wounded, police say.
Gun sales and a mental health crisis among young people, both of which spiked during virus-related lockdowns, are seen as risk factors in school shootings.
Armed confrontation in Austin-East Magnet High School in Tennessee state's Knoxville city leaves a student dead and an officer wounded, officials say.
The incident took place at Savo Vocational College located in Herman shopping centre in Kuopio, police say, adding it was too early to comment on the attacker's motive.
Two masked men armed with a gun, knives, axes and crossbows descended on a school in southern Brazil on Wednesday, killing five students and two adults before taking their own lives, authorities said.
Two assailants open fire inside a school near Sao Paulo, killing eight people before turning their weapons on themselves, authorities say.
A teenage gunman shot dead at least 20 people and injured 40 more before killing himself at a technical college where he was a student in Russian-annexed Crimea.
As federal investigators search for a motive in the deadly attack, hundreds of people also attended an emotional funeral service in Texas for a Pakistani exchange student, one of 10 people killed in Friday's rampage.
Student survivors of last month's shooting at a school in Parkland, Florida are set to join thousands others in Washington in what is expected to be their biggest demonstration yet to demand reforms in gun laws.
The exodus of corporate names began after the National Rifle Association launched a counter-offensive against a student-led campaign for tighter US gun laws.
Trump tweeted his strong stance one day after an emotional White House session where victims of the Florida school shooting told wrenching tales of lost lives and pleaded for action.
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