How does an executive order give the president power over the legislative branch?

Article II vests the executive power in the President, which gives him the power to oversee and direct the various aspects of the executive branch. ... When Congress does this, it is presumed that the President is authorized to issue executive orders to carry out Congress' goals in passing federal legislation.

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the values of the selma marchers was to bring   their ability to vote into law. mlk was not hat march, which was protesting toward lbj