even months later, CNN reports that Mueller has expanded his inquiry to include Russia’s potential leverage over the president and why he decided to run for president. According to sources who spoke to CNN, F.B.I. investigators have questioned witnesses about whether Trump showed an interest in running for president as far back as 2014, and how that desire coincided with his business ventures in Russia. The new line of inquiry confirms that Mueller is not just investigating potential obstruction of justice, but also allegations of collusion between the Trump campaign and Russia