The Senate’s constitutional duty is Advice and Consent. Their “advice” can surely be to “not consent” to allow review of a candidate. The Dems are using word play, as they often do. Can you just imagine what they would have done if George W. had tried to appoint 3 Supremes?
Point is, it is not without precedent. Many presidents have been denied SCOTUS nominations in their last year in office. Even Schumer held this view, until recently that is. The Dems are so butt hurt and pouty I bet they would filibuster Garland if Trump nominated him. They are children throwing a tantrum. Trump will do well to ignore them much as a parent will not indulge a child’s temper tantrum. Let them hold their breath. They’ll just get a headache and regret it later.