Did the Government violate Sanders's rights under the Fifth Amendment to have a grand jury consider the charge and to have the Government honor its implied agreement not to use later events against him?

QUESTION PRESENTED The Government charged Sanders with a conspiracy taking place on June 28, 2017. When Sanders pled guilty the Government reserved the right to charge him for relevant conduct that happened before June 28. Then the Government charged him with a conspiracy running from April 2016 to May 2017. At trial the Government presented evidence over Sanders’s objection of events happening on June 28, 2017, and after. Did the Government violate Sanders’s rights under the Fifth Amendment to have a grand jury consider the charge and to have the Government honor its implied agreement not to use later events against him? 1 STATEMENT OF