President-elect Joe Biden. REUTERS/Tom Brenner A rehearsal for President-elect Joe Biden's January 20 inauguration ceremony has been postponed because of security concerns, Politico reported. Law-enforcement agencies have boosted their security measures in the lead-up to Inauguration Day in the wake of last week's Capitol insurrection. The FBI said on Thursday that it was tracking an "extensive amount of concerning online chatter," including calls for armed protests in all states in the days ahead. Visit Business Insider's homepage for more stories. President-elect Joe Biden's inauguration rehearsal has been postponed because of security concerns, Politico reported.Two sources familiar with the matter told the outlet that the practice run for Biden's swearing-in ceremony, which was scheduled for Sunday, will now take place on Monday.