(Adds Trump comment on Portland paragraphs 9-10) * Illinois launches fourth legal challenge over federal use of National Guard in cities * Courts in Oregon and California say Trump likely overstepped * US government lawyers say Texas National Guard troops in transit to Chicago * Trump threatens to use Insurrection Act to sidestep any court restrictions By Nate Raymond and Dietrich Knauth Oct 6 (Reuters) – The state of Illinois and the city of Chicago sued President Donald Trump on Monday, seeking to block the deployment of federalized National Guard troops to Chicago, as hundreds of National Guard troops from Texas headed to the nation's third-largest city. Trump then escalated the widening clash with Democratic-led states and cities over the domestic use of military forces, threatening to

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