"Preemption has gained a new valence during this time of heightened political polarization. Tensions between governors and mayors have escalated in past few years with the tendency of republican-leaning state legislatures to preempt and even punish democratic-leaning local governments for enacting policies such as designating themselves as a “sanctuary city” to shield their undocumented immigrant population from the harsh deportation practices of the federal government. Mayors pushing progressive agendas are increasingly running into a wall of conservative state resistance through what some view as aggressive, and even “nuclear”, state preemption. There are hints of resistance that runs the other way as well, with more conservative cities and counties enacting “second amendment sanctuary” resolutions in response to the adoption of stricter gun controls by more progressive state legislatures." How does partisanship, or party politics, cause tension in a federalist government system?

By supporting contradicting policies.

Explanation:

The federalist government system is run by dividing the countries into smaller states. The country with give the state government with the power to regulate their own territory while still following the advice/directions from the central government.

A problem arise when different political parties started to take control over the government.

These parties usually have their own ideologies. So, the way the view how to solve certain issues are also different.  This caused a lot of infighting within the government body to determine which legislations should be passed by the government. This is what causing the tension within the federalist government.

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concurrent jurisdiction is the ability to exercise judicial review by different courts at the same time, within the same territory, and over the same subject matter. for instance, a domestic violence matter may be heard in either a general civil court or a family court in the same county. whichever court actually exercises its jurisdiction first will do so exclusively.