One Nation senator Malcolm Roberts claimed half of pregnant women vaccinated against COVID-19 experienced a miscarriage in contradiction of medical evidence.The Queensland senator faced criticism this week for his past controversial comments, including about debunked conspiracy theories, as the party's popularity placed more attention on Pauline Hanson's parliamentary team.The ABC can reveal previously unreported remarks made by Senator Roberts about the impact of COVID-19 vaccinations on pregnant women — claims that are contradicted by extensive medical evidence — during a live stream with anti-vax mandate activists four years ago.After suggesting the general miscarriage rate "around the world" was "about 13...